diff --git a/src/activities/memory-math-add/ActivityInfo.qml b/src/activities/memory-math-add/ActivityInfo.qml
--- a/src/activities/memory-math-add/ActivityInfo.qml
+++ b/src/activities/memory-math-add/ActivityInfo.qml
@@ -40,4 +40,5 @@
   credit: ""
   section: "math memory arithmetic"
   createdInVersion: 0
+  levels: "1,2,3,4,5,6,7,8,9,10"
 }
diff --git a/src/activities/memory-math-add/MemoryMathAdd.qml b/src/activities/memory-math-add/MemoryMathAdd.qml
--- a/src/activities/memory-math-add/MemoryMathAdd.qml
+++ b/src/activities/memory-math-add/MemoryMathAdd.qml
@@ -22,9 +22,7 @@
 import QtQuick 2.6
 
 import "../memory"
-import "memory-adddataset.js" as Dataset
 
 MemoryCommon {
-    dataset: Dataset.get()
     backgroundImg: "qrc:/gcompris/src/activities/memory/resource/background.svg"
 }
diff --git a/src/activities/memory-math-add/memory-adddataset.js b/src/activities/memory-math-add/memory-adddataset.js
deleted file mode 100644
--- a/src/activities/memory-math-add/memory-adddataset.js
+++ /dev/null
@@ -1,77 +0,0 @@
-/* GCompris
- *
- * Copyright (C) 2014 Bruno Coudoin
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 3 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License
- *   along with this program; if not, see <https://www.gnu.org/licenses/>.
- */
-
-.import "qrc:/gcompris/src/activities/memory/math_util.js" as Memory
-
-var memory_cards = [
-            { // Level 1
-                columns: 5,
-                rows: 2,
-                texts: Memory.getAddTable(1)
-            },
-            { // Level 2
-                columns: 5,
-                rows: 2,
-                texts: Memory.getAddTable(2)
-            },
-            { // Level 3
-                columns: 5,
-                rows: 2,
-                texts: Memory.getAddTable(3)
-            },
-            { // Level 4
-                columns: 5,
-                rows: 2,
-                texts: Memory.getAddTable(4)
-            },
-            { // Level 5
-                columns: 5,
-                rows: 2,
-                texts: Memory.getAddTable(5)
-            },
-            { // Level 6
-                columns: 5,
-                rows: 2,
-                texts: Memory.getAddTable(6)
-            },
-            { // Level 7
-                columns: 5,
-                rows: 2,
-                texts: Memory.getAddTable(7)
-            },
-            { // Level 8
-                columns: 5,
-                rows: 2,
-                texts: Memory.getAddTable(8)
-            },
-            { // Level 9
-                columns: 5,
-                rows: 2,
-                texts: Memory.getAddTable(9)
-            },
-            { // Level 10
-                columns: 5,
-                rows: 2,
-                texts: Memory.getAddTable(10)
-            }
-        ]
-
-
-function get() {
-    return memory_cards
-}
diff --git a/src/activities/memory-math-add/MemoryMathAdd.qml b/src/activities/memory-math-add/resource/1/Data.qml
copy from src/activities/memory-math-add/MemoryMathAdd.qml
copy to src/activities/memory-math-add/resource/1/Data.qml
--- a/src/activities/memory-math-add/MemoryMathAdd.qml
+++ b/src/activities/memory-math-add/resource/1/Data.qml
@@ -1,10 +1,9 @@
-/* gcompris - MemoryMathAdd.qml
+/* GCompris - Data.qml
  *
- * Copyright (C) 2014 JB BUTET <ashashiwa@gmail.com>
+ * Copyright (C) 2020 Deepak Kumar <deepakdk2431@gmail.com>
  *
  * Authors:
- *   Bruno Coudoin <bruno.coudoin@gcompris.net> (GTK+ version)
- *   JB BUTET <ashashiwa@gmail.com> (Qt Quick port)
+ *   Deepak Kumar <deepakdk2431@gmail.com>
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -17,14 +16,21 @@
  *   GNU General Public License for more details.
  *
  *   You should have received a copy of the GNU General Public License
- *   along with this program; if not, see <https://www.gnu.org/licenses/>.
+ *   along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
-import QtQuick 2.6
 
-import "../memory"
-import "memory-adddataset.js" as Dataset
+import GCompris 1.0
+import "qrc:/gcompris/src/activities/memory/math_util.js" as Memory
 
-MemoryCommon {
-    dataset: Dataset.get()
-    backgroundImg: "qrc:/gcompris/src/activities/memory/resource/background.svg"
+Data {
+    objective: qsTr("Find cards with equivalent quantities until 11.")
+    difficulty: 1
+
+    data: [
+        { // Level 1
+            columns: 5,
+            rows: 2,
+            texts: Memory.getAddTable(1)
+        }
+    ]
 }
diff --git a/src/activities/memory-math-add/MemoryMathAdd.qml b/src/activities/memory-math-add/resource/10/Data.qml
copy from src/activities/memory-math-add/MemoryMathAdd.qml
copy to src/activities/memory-math-add/resource/10/Data.qml
--- a/src/activities/memory-math-add/MemoryMathAdd.qml
+++ b/src/activities/memory-math-add/resource/10/Data.qml
@@ -1,10 +1,9 @@
-/* gcompris - MemoryMathAdd.qml
+/* GCompris - Data.qml
  *
- * Copyright (C) 2014 JB BUTET <ashashiwa@gmail.com>
+ * Copyright (C) 2020 Deepak Kumar <deepakdk2431@gmail.com>
  *
  * Authors:
- *   Bruno Coudoin <bruno.coudoin@gcompris.net> (GTK+ version)
- *   JB BUTET <ashashiwa@gmail.com> (Qt Quick port)
+ *   Deepak Kumar <deepakdk2431@gmail.com>
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -17,14 +16,21 @@
  *   GNU General Public License for more details.
  *
  *   You should have received a copy of the GNU General Public License
- *   along with this program; if not, see <https://www.gnu.org/licenses/>.
+ *   along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
-import QtQuick 2.6
 
-import "../memory"
-import "memory-adddataset.js" as Dataset
+import GCompris 1.0
+import "qrc:/gcompris/src/activities/memory/math_util.js" as Memory
 
-MemoryCommon {
-    dataset: Dataset.get()
-    backgroundImg: "qrc:/gcompris/src/activities/memory/resource/background.svg"
+Data {
+    objective: qsTr("Find cards with equivalent quantities until 20.")
+    difficulty: 5
+
+    data: [
+        { // Level 1
+            columns: 5,
+            rows: 2,
+            texts: Memory.getAddTable(10)
+        }
+    ]
 }
diff --git a/src/activities/memory-math-add/MemoryMathAdd.qml b/src/activities/memory-math-add/resource/2/Data.qml
copy from src/activities/memory-math-add/MemoryMathAdd.qml
copy to src/activities/memory-math-add/resource/2/Data.qml
--- a/src/activities/memory-math-add/MemoryMathAdd.qml
+++ b/src/activities/memory-math-add/resource/2/Data.qml
@@ -1,10 +1,9 @@
-/* gcompris - MemoryMathAdd.qml
+/* GCompris - Data.qml
  *
- * Copyright (C) 2014 JB BUTET <ashashiwa@gmail.com>
+ * Copyright (C) 2020 Deepak Kumar <deepakdk2431@gmail.com>
  *
  * Authors:
- *   Bruno Coudoin <bruno.coudoin@gcompris.net> (GTK+ version)
- *   JB BUTET <ashashiwa@gmail.com> (Qt Quick port)
+ *   Deepak Kumar <deepakdk2431@gmail.com>
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -17,14 +16,21 @@
  *   GNU General Public License for more details.
  *
  *   You should have received a copy of the GNU General Public License
- *   along with this program; if not, see <https://www.gnu.org/licenses/>.
+ *   along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
-import QtQuick 2.6
 
-import "../memory"
-import "memory-adddataset.js" as Dataset
+import GCompris 1.0
+import "qrc:/gcompris/src/activities/memory/math_util.js" as Memory
 
-MemoryCommon {
-    dataset: Dataset.get()
-    backgroundImg: "qrc:/gcompris/src/activities/memory/resource/background.svg"
+Data {
+    objective: qsTr("Find cards with equivalent quantities until 12.")
+    difficulty: 2
+
+    data: [
+        { // Level 1
+            columns: 5,
+            rows: 2,
+            texts: Memory.getAddTable(2)
+        }
+    ]
 }
diff --git a/src/activities/memory-math-add/MemoryMathAdd.qml b/src/activities/memory-math-add/resource/3/Data.qml
copy from src/activities/memory-math-add/MemoryMathAdd.qml
copy to src/activities/memory-math-add/resource/3/Data.qml
--- a/src/activities/memory-math-add/MemoryMathAdd.qml
+++ b/src/activities/memory-math-add/resource/3/Data.qml
@@ -1,10 +1,9 @@
-/* gcompris - MemoryMathAdd.qml
+/* GCompris - Data.qml
  *
- * Copyright (C) 2014 JB BUTET <ashashiwa@gmail.com>
+ * Copyright (C) 2020 Deepak Kumar <deepakdk2431@gmail.com>
  *
  * Authors:
- *   Bruno Coudoin <bruno.coudoin@gcompris.net> (GTK+ version)
- *   JB BUTET <ashashiwa@gmail.com> (Qt Quick port)
+ *   Deepak Kumar <deepakdk2431@gmail.com>
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -17,14 +16,21 @@
  *   GNU General Public License for more details.
  *
  *   You should have received a copy of the GNU General Public License
- *   along with this program; if not, see <https://www.gnu.org/licenses/>.
+ *   along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
-import QtQuick 2.6
 
-import "../memory"
-import "memory-adddataset.js" as Dataset
+import GCompris 1.0
+import "qrc:/gcompris/src/activities/memory/math_util.js" as Memory
 
-MemoryCommon {
-    dataset: Dataset.get()
-    backgroundImg: "qrc:/gcompris/src/activities/memory/resource/background.svg"
+Data {
+    objective: qsTr("Find cards with equivalent quantities until 13.")
+    difficulty: 3
+
+    data: [
+        { // Level 1
+            columns: 5,
+            rows: 2,
+            texts: Memory.getAddTable(3)
+        }
+    ]
 }
diff --git a/src/activities/memory-math-add/MemoryMathAdd.qml b/src/activities/memory-math-add/resource/4/Data.qml
copy from src/activities/memory-math-add/MemoryMathAdd.qml
copy to src/activities/memory-math-add/resource/4/Data.qml
--- a/src/activities/memory-math-add/MemoryMathAdd.qml
+++ b/src/activities/memory-math-add/resource/4/Data.qml
@@ -1,10 +1,9 @@
-/* gcompris - MemoryMathAdd.qml
+/* GCompris - Data.qml
  *
- * Copyright (C) 2014 JB BUTET <ashashiwa@gmail.com>
+ * Copyright (C) 2020 Deepak Kumar <deepakdk2431@gmail.com>
  *
  * Authors:
- *   Bruno Coudoin <bruno.coudoin@gcompris.net> (GTK+ version)
- *   JB BUTET <ashashiwa@gmail.com> (Qt Quick port)
+ *   Deepak Kumar <deepakdk2431@gmail.com>
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -17,14 +16,21 @@
  *   GNU General Public License for more details.
  *
  *   You should have received a copy of the GNU General Public License
- *   along with this program; if not, see <https://www.gnu.org/licenses/>.
+ *   along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
-import QtQuick 2.6
 
-import "../memory"
-import "memory-adddataset.js" as Dataset
+import GCompris 1.0
+import "qrc:/gcompris/src/activities/memory/math_util.js" as Memory
 
-MemoryCommon {
-    dataset: Dataset.get()
-    backgroundImg: "qrc:/gcompris/src/activities/memory/resource/background.svg"
+Data {
+    objective: qsTr("Find cards with equivalent quantities until 14.")
+    difficulty: 3
+
+    data: [
+        { // Level 1
+            columns: 5,
+            rows: 2,
+            texts: Memory.getAddTable(4)
+        }
+    ]
 }
diff --git a/src/activities/memory-math-add/MemoryMathAdd.qml b/src/activities/memory-math-add/resource/5/Data.qml
copy from src/activities/memory-math-add/MemoryMathAdd.qml
copy to src/activities/memory-math-add/resource/5/Data.qml
--- a/src/activities/memory-math-add/MemoryMathAdd.qml
+++ b/src/activities/memory-math-add/resource/5/Data.qml
@@ -1,10 +1,9 @@
-/* gcompris - MemoryMathAdd.qml
+/* GCompris - Data.qml
  *
- * Copyright (C) 2014 JB BUTET <ashashiwa@gmail.com>
+ * Copyright (C) 2020 Deepak Kumar <deepakdk2431@gmail.com>
  *
  * Authors:
- *   Bruno Coudoin <bruno.coudoin@gcompris.net> (GTK+ version)
- *   JB BUTET <ashashiwa@gmail.com> (Qt Quick port)
+ *   Deepak Kumar <deepakdk2431@gmail.com>
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -17,14 +16,21 @@
  *   GNU General Public License for more details.
  *
  *   You should have received a copy of the GNU General Public License
- *   along with this program; if not, see <https://www.gnu.org/licenses/>.
+ *   along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
-import QtQuick 2.6
 
-import "../memory"
-import "memory-adddataset.js" as Dataset
+import GCompris 1.0
+import "qrc:/gcompris/src/activities/memory/math_util.js" as Memory
 
-MemoryCommon {
-    dataset: Dataset.get()
-    backgroundImg: "qrc:/gcompris/src/activities/memory/resource/background.svg"
+Data {
+    objective: qsTr("Find cards with equivalent quantities until 15.")
+    difficulty: 3
+
+    data: [
+        { // Level 1
+            columns: 5,
+            rows: 2,
+            texts: Memory.getAddTable(5)
+        }
+    ]
 }
diff --git a/src/activities/memory-math-add/MemoryMathAdd.qml b/src/activities/memory-math-add/resource/6/Data.qml
copy from src/activities/memory-math-add/MemoryMathAdd.qml
copy to src/activities/memory-math-add/resource/6/Data.qml
--- a/src/activities/memory-math-add/MemoryMathAdd.qml
+++ b/src/activities/memory-math-add/resource/6/Data.qml
@@ -1,10 +1,9 @@
-/* gcompris - MemoryMathAdd.qml
+/* GCompris - Data.qml
  *
- * Copyright (C) 2014 JB BUTET <ashashiwa@gmail.com>
+ * Copyright (C) 2020 Deepak Kumar <deepakdk2431@gmail.com>
  *
  * Authors:
- *   Bruno Coudoin <bruno.coudoin@gcompris.net> (GTK+ version)
- *   JB BUTET <ashashiwa@gmail.com> (Qt Quick port)
+ *   Deepak Kumar <deepakdk2431@gmail.com>
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -17,14 +16,21 @@
  *   GNU General Public License for more details.
  *
  *   You should have received a copy of the GNU General Public License
- *   along with this program; if not, see <https://www.gnu.org/licenses/>.
+ *   along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
-import QtQuick 2.6
 
-import "../memory"
-import "memory-adddataset.js" as Dataset
+import GCompris 1.0
+import "qrc:/gcompris/src/activities/memory/math_util.js" as Memory
 
-MemoryCommon {
-    dataset: Dataset.get()
-    backgroundImg: "qrc:/gcompris/src/activities/memory/resource/background.svg"
+Data {
+    objective: qsTr("Find cards with equivalent quantities until 16.")
+    difficulty: 4
+
+    data: [
+        { // Level 1
+            columns: 5,
+            rows: 2,
+            texts: Memory.getAddTable(6)
+        }
+    ]
 }
diff --git a/src/activities/memory-math-add/MemoryMathAdd.qml b/src/activities/memory-math-add/resource/7/Data.qml
copy from src/activities/memory-math-add/MemoryMathAdd.qml
copy to src/activities/memory-math-add/resource/7/Data.qml
--- a/src/activities/memory-math-add/MemoryMathAdd.qml
+++ b/src/activities/memory-math-add/resource/7/Data.qml
@@ -1,10 +1,9 @@
-/* gcompris - MemoryMathAdd.qml
+/* GCompris - Data.qml
  *
- * Copyright (C) 2014 JB BUTET <ashashiwa@gmail.com>
+ * Copyright (C) 2020 Deepak Kumar <deepakdk2431@gmail.com>
  *
  * Authors:
- *   Bruno Coudoin <bruno.coudoin@gcompris.net> (GTK+ version)
- *   JB BUTET <ashashiwa@gmail.com> (Qt Quick port)
+ *   Deepak Kumar <deepakdk2431@gmail.com>
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -17,14 +16,21 @@
  *   GNU General Public License for more details.
  *
  *   You should have received a copy of the GNU General Public License
- *   along with this program; if not, see <https://www.gnu.org/licenses/>.
+ *   along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
-import QtQuick 2.6
 
-import "../memory"
-import "memory-adddataset.js" as Dataset
+import GCompris 1.0
+import "qrc:/gcompris/src/activities/memory/math_util.js" as Memory
 
-MemoryCommon {
-    dataset: Dataset.get()
-    backgroundImg: "qrc:/gcompris/src/activities/memory/resource/background.svg"
+Data {
+    objective: qsTr("Find cards with equivalent quantities until 17.")
+    difficulty: 4
+
+    data: [
+        { // Level 1
+            columns: 5,
+            rows: 2,
+            texts: Memory.getAddTable(7)
+        }
+    ]
 }
diff --git a/src/activities/memory-math-add/MemoryMathAdd.qml b/src/activities/memory-math-add/resource/8/Data.qml
copy from src/activities/memory-math-add/MemoryMathAdd.qml
copy to src/activities/memory-math-add/resource/8/Data.qml
--- a/src/activities/memory-math-add/MemoryMathAdd.qml
+++ b/src/activities/memory-math-add/resource/8/Data.qml
@@ -1,10 +1,9 @@
-/* gcompris - MemoryMathAdd.qml
+/* GCompris - Data.qml
  *
- * Copyright (C) 2014 JB BUTET <ashashiwa@gmail.com>
+ * Copyright (C) 2020 Deepak Kumar <deepakdk2431@gmail.com>
  *
  * Authors:
- *   Bruno Coudoin <bruno.coudoin@gcompris.net> (GTK+ version)
- *   JB BUTET <ashashiwa@gmail.com> (Qt Quick port)
+ *   Deepak Kumar <deepakdk2431@gmail.com>
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -17,14 +16,21 @@
  *   GNU General Public License for more details.
  *
  *   You should have received a copy of the GNU General Public License
- *   along with this program; if not, see <https://www.gnu.org/licenses/>.
+ *   along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
-import QtQuick 2.6
 
-import "../memory"
-import "memory-adddataset.js" as Dataset
+import GCompris 1.0
+import "qrc:/gcompris/src/activities/memory/math_util.js" as Memory
 
-MemoryCommon {
-    dataset: Dataset.get()
-    backgroundImg: "qrc:/gcompris/src/activities/memory/resource/background.svg"
+Data {
+    objective: qsTr("Find cards with equivalent quantities until 18.")
+    difficulty: 4
+
+    data: [
+        { // Level 1
+            columns: 5,
+            rows: 2,
+            texts: Memory.getAddTable(8)
+        }
+    ]
 }
diff --git a/src/activities/memory-math-add/MemoryMathAdd.qml b/src/activities/memory-math-add/resource/9/Data.qml
copy from src/activities/memory-math-add/MemoryMathAdd.qml
copy to src/activities/memory-math-add/resource/9/Data.qml
--- a/src/activities/memory-math-add/MemoryMathAdd.qml
+++ b/src/activities/memory-math-add/resource/9/Data.qml
@@ -1,10 +1,9 @@
-/* gcompris - MemoryMathAdd.qml
+/* GCompris - Data.qml
  *
- * Copyright (C) 2014 JB BUTET <ashashiwa@gmail.com>
+ * Copyright (C) 2020 Deepak Kumar <deepakdk2431@gmail.com>
  *
  * Authors:
- *   Bruno Coudoin <bruno.coudoin@gcompris.net> (GTK+ version)
- *   JB BUTET <ashashiwa@gmail.com> (Qt Quick port)
+ *   Deepak Kumar <deepakdk2431@gmail.com>
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -17,14 +16,21 @@
  *   GNU General Public License for more details.
  *
  *   You should have received a copy of the GNU General Public License
- *   along with this program; if not, see <https://www.gnu.org/licenses/>.
+ *   along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
-import QtQuick 2.6
 
-import "../memory"
-import "memory-adddataset.js" as Dataset
+import GCompris 1.0
+import "qrc:/gcompris/src/activities/memory/math_util.js" as Memory
 
-MemoryCommon {
-    dataset: Dataset.get()
-    backgroundImg: "qrc:/gcompris/src/activities/memory/resource/background.svg"
+Data {
+    objective: qsTr("Find cards with equivalent quantities until 19.")
+    difficulty: 5
+
+    data: [
+        { // Level 1
+            columns: 5,
+            rows: 2,
+            texts: Memory.getAddTable(9)
+        }
+    ]
 }