# Solve Decimal Problems Using Mental Math

## Opening

# Solve Decimal Problems Using Mental Math

- Solve these problems using mental math.

0.3 × 7

3 × 0.7

0.3 × 0.7

0.03 × 0.7

21 ÷ 0.7

2.1 ÷ 3

2.1 ÷ 0.3

210 ÷ 0.7

- Compare your solutions with those of your classmates.
- Discuss the strategies you used to find the solutions.