Show:
Rounding
Ordering / Place Value
Properties
Estimating Sums
Estimating Differences
100

345 rounded to the nearest 10

350

100
Order from least to greatest: 234, 243, 203, 223

203, 223, 234, 243

100

True or False

54 + 0 = 0

False 

54 + 0 = 54

100

Estimate 

243 + 134

240 + 130 = 370

200 + 100 = 300

100

Estimate

467 - 321

470 - 320 = 150

500 - 300 = 200

200

278 rounded to the nearest 100

300

200

What is 956 written in expanded form?

900 + 50 + 6

200

True or False

23 + 12 = 12 + 23

True 

Commutative Property

200

Estimate

762 + 212

760 + 210 = 970

800 + 200 = 1,000

200

Estimate

276 - 256

280 - 260 = 20

300 - 300 = 0

300

949 rounded to the nearest 10

950

300

Order from greatest to least: 567, 576, 607, 557

607, 576, 567, 557

300

True or False

34 +(12 + 10) = (34 + 12) + 10

True

Associative Property

300

Estimate 

456 + 325

460 + 330 = 790

500 + 300 = 800

300

Estimate

743 - 434

740 - 430 = 310

700 - 400 = 300

400

951 rounded to the nearest 100

1,000

400

What is two hundred fifty-four written in expanded form?

200 + 50 + 4

400

True or False

100 + (10 + 12) = (110 + 10) + 12

False

The numbers are not the same of both sides.

400

Estimate 

101 + 224 + 132

100 + 200 + 100 = 400

100 + 220 + 130 = 450

400

Estimate 

888 - 645

890 - 650 = 240

900 - 600 = 300 

500

Which number does not belong?

245

251

255

253

255 - it rounds to 260

245 - it rounds to 200

500

Compare the two numbers: 

three hundred thirty-two and 300 + 30 + 4

332 < 334

500

True or False

9 + (13 + 21) = (9 + 21) + 13

True

Both Commutative and Associative Property were used. Both sides equal 43

500

Estimate

423 + 245 + 309

420 + 250 + 310 = 980

400 + 200 + 300 = 900

500

Estimate

567 - 423 - 121

570 - 420 - 120 = 30

600 - 400 - 100 = 100