LESSON 3 Handy Facts

Explore Multiplication Strategies

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1. Mara says, “3 6 = 19.” Do you agree? Show Mara how to use a number line to check her answer.
2. Richard uses addition doubles to multiply by 2.

Use Richard's strategy and write the doubles addition fact he could use to solve each multiplication problem.

1. 2 5 =
2. 3 2 =
3. 2 9 =
4. 2 2 =
5. 2 8 =
6. 6 2 =

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3. Emily thinks about base-ten pieces when she multiplies by 10s. What pattern helps you remember the facts for 10?