Represent teen numbers with addition and subtraction equations involving one 10. Represent 10 using a number bond and 10-frame with a missing addend. Use Notice and Wonder with a 10-frame, connecting ...

Column subtraction is a way of subtracting larger numbers. It is called column subtraction, because you write one number underneath the other, using place value to sort the tens and ones in separate ...

Becoming comfortable with two-digit and three-digit numbers is an important skill. Becoming comfortable with two-digit and three-digit numbers is an important skill in second grade. Your child will ...