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add the terms tens and hundreds
In column 2 and 3 digit addition, you are carrying over 1 ten or one hundred. I think it is confusing to have a prompt that does not include the proper term based on place value.
4 votes 
Mixed question types in addition and subtraction
Have a set of questiion that have some Q without exchanging, some with T to U and some with H to T and some double and triple borrowing, so the student has to decide which to do first.
3 votes 
Option to Search Exercises
I think Happy Numbers would be improved with a ‘Search’ option.
2 votes
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