Learn how column addition can be used to make adding numbers easier. Add numbers with 4 digits or more together Discover how to add more than 4-digits together. 10 more and 10 less Learn on how to ...

They say it helps children compose and decompose numbers, which is useful in learning addition and subtraction facts. For example, 7 + 5 can be a tricky sum to learn. But a child who can subitize ...