In practice kids playing "Practice subtraction in a fun way will never do a subtraction, rather count intervals.
Title and goal could be changed. This obviously must be agreed before doing done :)
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I agree this activity could be renamed "count intervals", or something like that.
Actually the rest looks good already (goal and manual text), as it properly describes the activity and doesn't talk about subtractions.
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This task got a bit lost in the backlog, as I was waiting for more comments before proceeding.
But I guess it's ok to proceed now.
It will not be changed for the coming release as it's in string freeze, but it can be changed in master branch for the next one.