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
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
I think Happy Numbers would be improved with a ‘Search’ option.2 votes
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