Place Value Chart | Grade 2. Special | 2m 23s. Becoming comfortable with two-digit and three-digit numbers is an important skill in second grade. Your child will master addition and subtraction ...

XtraMath helps kids gain fluency in addition, subtraction, multiplication, and division. The program is conceptually similar to flash cards. Credit: Ian Moore / mashable As COVID-19 was spreading ...

It was about 12 years ago when Paul Britt noticed a problem. His students were struggling with subtraction, using algorithms they learned from addition that did not translate to the new operation ...