Everyday Mathematics4 at Home |
Unit Resources |
Grade 2 Unit 2: |
Background Information |
Lesson 2-4 Vocabulary
Helper facts
Well-known facts you can use to solve other facts. For example, if you know 2 x 7 = 14, then you can add a group of 7, 14 + 7 = 21 to find 3 x 7 = 21.