Lesson

Multiplication looks at equally sized groups. Doubling means multiplying equally sized groups by $2$2. Can you solve this problem?

$2\times8$2×8

$4$4 groups is twice (two times) as many as $2$2 groups. Let's look at how to multiply numbers by $4$4 using the Double, Double strategy.

$4\times8$4×8

Remember!

- Double means "multiply by $2$2."
- To multiply a number by $4$4, you can use the Double, Double strategy. That means, double the number, then double the answer.

Recall multiplication facts up to 10 × 10 and related division facts