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McGraw-Hill Math Grade 3 Answer Key Chapter 3 Lesson 11 Estimating Differences
Estimate
Estimate each difference. Round to the nearest ten and then subtract.
Question 1.
Answer:
61 – 24 = 37.
Explanation:
Nearest ten of:
61 = 60.
24 = 20.
60 – 20 = 40.
Question 2.
Answer:
47 – 15 = 32.
Explanation:
Nearest ten of:
47 = 50.
15 = 20.
50 – 20 = 30.
Question 3.
Answer:
84 – 32 = 52.
Explanation:
Nearest ten of:
84 = 80.
32 = 30.
80 – 30 = 50.
Question 4.
Answer:
73 – 62 = 11.
Explanation:
Nearest ten of:
73 = 70.
62 = 60.
70 – 60 = 10.
Estimate each difference. Round each nearest hundred and then subtract.
Question 5.
Answer:
681 – 346 = 335.
Explanation:
Nearest hundred of:
681 = 700.
346 = 300.
700 – 300 = 400.
Question 6.
Answer:
575 – 439 = 136.
Explanation:
Nearest hundred of:
575 = 600.
439 = 400.
600 – 400 = 200.
Question 7.
Answer:
727 – 166 = 561.
Explanation:
Nearest hundred of:
727 = 700.
166 = 200.
700 – 200 = 500.