When it came time to help her first-graders through a tricky subtraction problem, Rosalie Carr reached for a new arsenal of colored chips, base-10 bars and mighty “ number bonds.”. The hands-on math ...

It covers the Primary One to Three levels, and aims to develop children’s mental calculation skills through the number bonds approach of Singapore Math.

Editor’s note: Bill Jackson was a Paterson, New Jersey math teacher and a district-wide math teacher trainer in Scarsdale, New York. He also provides consulting and teacher training on Singapore ...