Fact families: what’s behind my back?

Are there any numbers in your family? Well then you must not have a fact family! In this lesson we explore fact families: three numbers that make addition and subtraction sentences together. Learning fact families helps students relate addition and subtraction, solve for unknowns, and identify missing addends. I'd like number 24,702,831 to be in my family.

More about

Addition and Subtraction - 1st grade