Estimating Products and Quotients

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Estimating Products and Quotients

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Estimating Products and Quotients Multiply Divide

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)

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

Estimate using compatible numbers. 61.2 ÷ 6.94 Round the divisor 61.2 ÷ 7 7 14 21 28 35 42 49 56 63 1 2 3 4 5 6 7 8 9 Change the dividend to the nearest multiple of the new divisor. 63 ÷ 7 Divide. 63 ÷ 7 = 9 61.2 ÷ 6.94 ≈ 9

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

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

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