Use Notice and Wonder with a 10-frame, connecting cubes, and place-value cards to ask and answer math questions. Then, represent teen numbers using addition and subtraction equations and one 10.

Object Details Description This illustrated pamphlet describes the operation of manual and electrically operated versions of the Underwood Sundstrand printing adding machine. Addition, subtraction, ...

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 ...