Key Idea1 of 3
Find the Missing Number
If you see ___ + 6 = 11, think of the fact family: 5, 6, 11. The missing number is 5! Knowing fact families lets you solve problems quickly. When addition is hard, try subtraction: 11 - 6 = 5.
Loading...
Mathematics — Fact Families: Related Addition and Subtraction
If you see ___ + 6 = 11, think of the fact family: 5, 6, 11. The missing number is 5! Knowing fact families lets you solve problems quickly. When addition is hard, try subtraction: 11 - 6 = 5.