? You're cordially invited to come check out our growing library of award-winning math video animations at https://www.numberock.com ? Thank you for watching our Subtraction With Regrouping Song. »»-------------¤-------------««»»-------------¤-------------«« Q. Why do we regroup in subtraction? A. In a subtraction problem, you need to regroup if there are not enough ones or tens to subtract. Q. What grade levels do this video target? A. This video targets learning standards in 3rd Grade and 4th Grade. This video also targets standards in the UK from KS2 (Year 4-5) Q. Where did you guys come from? A. Numberock is a project that I, Mr. Hehn, began as a 5th Grade math teacher of 7 years. It came together after years of experimenting with my lessons trying to figure out the best way to help my students retain the math concepts they were learning. Q. Does Numberock drive real results in the classroom? A. I knew I found the secret sauce when not only were my students retainin