Add three numbers
Estimate sums with three numbers
Estimate to the nearest 100th
(in your head)
Estimate to the nearest 10th (in your head)
Threes Facts
100

320 + 102 + 411

833

100

320 + 102 + 411

800

100

352 + 128

500

100

324 + 315

640

100

3 X 2

6

200

429 + 300 + 223

952

200

429 + 390 + 223

900

200

142 + 671

800

200

493 - 112

380

200

3 X 4

14
300

521 + 112 + 309

942

300

521 + 172 + 309

1,000

300

690 - 321

400

300

255 + 159

420

300
3 X 6

18

400

145 + 327 + 713

1,185

400

155 + 327 + 713

1,200

400

432 - 108

300

400

691 - 322

370

400

3 X 11

33

500

974 + 36 + 614

1,624

500

974 + 96 + 614

1,700

500

960 + 321

1,300

500

987 - 326

670

500

3 X 12

36

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