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Partial Sums
Partial Differences
3 or More Numbers
Estimate and Solve
Mental Math
100

Use partial sums to break this addition equation into 100s, 10s, and 1s.

Solve and share your answer. Show your work!

345 + 534 = ?

300 + 500 = 800

40 + 30 = 70

5 + 4 = 9 

Answer: 879

100

Use a number line to solve the following equation using partial differences.

316 - 104 = ?

212

100

142 + 135 + 178 = ?

455

100

Round to the nearest 10 and solve for the correct answer.

230 + 423 = ?

650

653

100

234 + 124 = ?

358

200

Use partial sums to break this addition equation into 100s, 10s, and 1s.

Solve and share your answer. Show your work!

123 + 765 = ?

100 + 700 = 800

20 + 60 = 80

3 + 5 = 8 

Answer: 888

200

Use a number line to solve the following equation using partial differences.

583 - 261 = ?

322

200

267 + 246 + 167 = ?

680

200

Round to the nearest 10 and solve for the correct answer.

467 + 245 = ?

720

712

200

425 + 268 = ?

693

300

Use partial sums to break this addition equation into 100s, 10s, and 1s.

Solve and share your answer. Show your work!

384 + 427 = ?

300 + 400 = 700

80 + 20 = 100

4 + 7 = 11

Answer:811

300

Use a number line to solve the following equation using partial differences.

786 - 358 = ?

428

300

578 + 649 + 267 = ?

1,494

300

Round to the nearest 10 and solve for the correct answer.

256 + 853 = ?

1,110

1,109

300

987 + 786 = ?

1,773

400

Use partial sums to break this addition equation into 100s, 10s, and 1s.

Solve and share your answer. Show your work!

476 + 935 = ?

400 + 900 = 1,300

70 + 30 = 100

6 + 5 = 11

Answer: 1,411

400

Use a number line to solve the following equation using partial differences.

947 - 682 = ?

265

400

687 + 238 + 131 + 23 = ?

1,079

400

Round to the nearest 10 and solve for the correct answer.

946 + 897 = ?

1,850

1,843

400

346 + 234 + 312 = ?

892

500

Use partial sums to break this addition equation into 100s, 10s, and 1s.

Solve and share your answer. Show your work!

1234 + 6789 = ?

1000 + 6000 = 7000

200 + 700 = 900

30 + 80 = 110

4 + 9 = 13

Answer: 8023

500

Use a number line to solve the following equation using partial differences.

6584 - 3893 = ?

2,691

500

673 + 284 + 132 + 876 = ?

1,965

500

Round to the nearest 10 and solve for the correct answer.

763 + 542 + 231 = ?

1,530

1,536

500

984 + 234 + 546 = ?

1,764