Excellent
This teaching tool for column subtraction is excellent. It is just the way I was taught, and I am confident my daughter (aged nine) will find it helpful. I previously reviewed another subtraction method by this developer called 'Column Subtraction'. I much prefer this new one. I am glad the developer seems to have taken on board my comments, and has released this one. Thanks
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Wonderful.
This app has helped my 8 year old son immensely. He used to get confused with the borrowing and the problems he made up top would prevent him from getting the right answer. This app helped by focusing on one thing at a time. I love that I can create custom problems for him.