1. Estimating Products and Quotients
Multiply
Divide

2. Warm-Up
Spot the Dog lost 1.85 pounds after his surgery. Two weeks later he had gained back 1.2 pounds. What number represents his total change in weight since the surgery?
Keyla ran miles each day for 5 days. What was the total distance she ran over these 5 days?
7(6)

3. VOCAB
Compatible #’s:
easy to compute in your head 10 5
100 2 1

4. Estimate using compatible numbers.
61.2 ÷ 6.94
Round the divisor ÷ 7
Change the dividend to the nearest
multiple of the new divisor ÷ 7
Divide ÷ 7 = 9
61.2 ÷ 6.94 ≈ 9

5. Estimate using compatible numbers.
Choose a compatible number for the mixed number.
Multiply.

6. Estimate using compatible numbers.
–31.82 ÷ (–3.19)
11.4 ÷ (–1.78)

7. Communication Prompt
How are compatible numbers helpful when dividing two
rational numbers?