working with the number one might give those wids a better clue as to what's going on Today I used the number three and 27or 28 students got it right way. There were about 10 students who just took a long time to solve it. If you look that ratio think using the number three to present the problem turned out OK Mr. Tsubota, vice principal lead this comment. Mr. Tsubota You had those cards right? The problem with subtracting a two- digit number from a three digit number where you end up with a difference of