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## McGraw-Hill Math Grade 7 Answer Key Lesson 1.3 Estimating Sums and Differences

**Estimate**

Question 1.

122 + 82

Answer: 204

122

+82

204

The sum of two numbers 122 and 82 is 204.

The estimated sum is 200.

Question 2.

249 + 357

Answer: 606

249

+357

606

The sum of the two numbers 249 and 357 is 606.

The estimated sum is 606.

Question 3.

25 + 78

Answer: 103

25

+78

103

The sum of two numbers 25 and 78 is 103.

The estimated sum is 100.

Question 4.

239 + 555

Answer: 794

239

+555

794

The sum of two numbers 239 and 555 is 794.

The estimated sum is 800.

Question 5.

31 + 131

Answer: 162

131

+31

162

The sum of two numbers 131 and 31 is 162

The estimated sum is 160.

Question 6.

45 + 21

Answer: 66

45

+21

66

The sum of two numbers 45 and 21 is 66.

The estimated sum is 70.

Question 7.

147 + 97

Answer: 244

147

+97

244

The sum of two numbers 147 and 97 is 244.

The estimated sum is 240.

Question 8.

333 – 203

Answer: 130

333

-203

130

The difference between 333 and 203 is 130.

The estimated difference is 130.

Question 9.

2119 – 932

Answer: 1187

2119

-932

1187

The difference between 2119 and 932 is 1187.

The estimated difference is 1200.

Question 10.

575 + 639

Answer: 1214

575

+639

1214

The sum of two numbers 575 and 639 is 1214.

The estimated sum is 1200.

Question 11.

711 – 236

Answer: 475

711

-236

475

The difference of 711 and 236 is 475.

The estimated difference is 500.

Question 12.

23 + 11

Answer: 34

23

+11

34

The sum of two numbers is 23 and 11 is 34

The estimated sum is 30.

Question 13.

57450 – 4997

Answer: 52453

57450

-4997

52453

The difference of 57450 and 4997 is52453.

The estimated difference is 52500.

Question 14.

4723 + 154

Answer: 4877

4723

+154

4877

The sum of two numbers 4723 and 154 is 487.

The estimated sum is 4877.

Question 15.

45 + 557 + 78

Answer: 680

557

+78

+45

680

The sum of the three numbers is 557, 78, 45, and 680.

The estimated sum is 700.

Question 16.

345 + 167

Answer: 512

345

+167

512

The sum of two numbers 345 and 167 is 512.

The estimated sum is 500.

Question 17.

105555 – 15559

Answer: 89996

105555

-15559

89996

The difference of the two numbers 105555 and 15559 is 89996.

The estimated difference is 90,000

Question 18.

3454 + 549 + 777

Answer: 4780

3454

549

+777

4780

The sum of three numbers 3454, 549 and 777 is 4780.

The estimated sum is 5000.

Question 19.

10329 – 5784

Answer: 4545

10329

-5784

4545

The difference of two numbers 10329 and 5784 is 4545.

The estimated difference is 4500.