Trinity had 13 snowballs. She threw 5 at Kedric. How many does she have left? What subtraction sentence should we use to help Trinity? 13 - 5 = ___
If 13 - 5 = 8, what is the missing number in 13 - ___ = 5? 13 - 5 = 8 13 - ___ = 5 We can find the missing number using a fact family! A fact family is made up of 2 subtraction sentences with the same parts and whole. Show Me 8 13 - 5 = 8 13 - ___ = 5
This is a fact-family triangle. The parts are in the bottom corners of the triangle, and the whole is at the top.
Fact-family triangles can help us form fact families. Both subtraction sentences use the same numbers in the fact-family triangle.