C. Using Twos
Do these problems in your head. Write only the answers.
- 2 × 9 =
- 3 × 20 =
- 2 × 100 =
- 5 × 2 =
- 5 × 20 =
- 20 × 2 =
- 4 × 2 =
- 6 × 2 =
- 2 × 7 =
- 2 × 0 =
- How does Question D help you solve Question E?
Do these problems in your head. Write only the answers.