More math fun with Common Core


by Howard Portnoy

To this method’s credit, it doesn’t have the kids draw a bajillion little boxes to represent the numbers. To its discredit, the method complicates a fairly straightforward process for multi-place subtraction by using a method called counting up.

The problem, which is intended for students in Grade 4 (aged 9), asks them to find the difference between 325 and 38. Using the old-fangled method, you stack the numbers with the larger value on top, then “borrow” and subtract:


Continue Reading at

Posting Policy
We have no tolerance for comments containing violence, racism, vulgarity, profanity, all caps, or discourteous behavior. Thank you for partnering with us to maintain a courteous and useful public environment where we can engage in reasonable discourse. Read more.

Trending on Liberty Alliance

Don't miss a thing. Sign up for our email newsletter to become a Liberty Alliance insider.