Show:
Partial Sums
Using Expanded Form
Partial Differences
Break Apart the Subtrahend
Use Rounding to find the Estimated Sum or Difference
Add 3 Numbers
Place Value & Regrouping
100

Use PARTIAL SUMS to find the sum of

 135 + 152 = 

What is 287

100 + 30 + 5

100 + 50 + 2

100

Use PARTIAL DIFFERENCES to find the difference of

489 - 253 = 

What is 236

489-200 = 289

289 - 50 = 239

259 - 3  = 236


100

Estimate the sum by rounding to the nearest ten

236 + 217 = 

What is about 460

236  rounds to 240

217 rounds to 220

100

209 + 48 + 312 = 

What is 569

100


In 539 which digit is in the tens place?



3

200

Use PARTIAL SUMS to find the sum of

650 + 138 = 

What is 788

600 + 50 + 0

100 + 30 + 8

200

Use PARTIAL DIFFERENCES to find the difference of

544 - 162 = 

What is 382

544 - 100 = 444

444 - 40 = 404

404 - 20 = 384

384 -  2 = 382 

200

Estimate the sum by rounding to the nearest ten

407 + 436 = 


What is about 850

407 rounds to 410

436 rounds to 440

200

412 + 273 + 139 = 

What is 824

200

In 729, which digit is in the ones place?



9



300

Use PARTIAL SUMS to find the sum of

535 + 423 = 

What is 958

500 + 30 + 5

400 + 20 + 3 

300

Use PARTIAL DIFFERENCES to find the difference of

856 - 328 = 

What is 528

856 - 300 = 556

556 - 20 - 536

536 - 6 = 530

530 - 2 = 528

300

Estimate the sum by rounding to the nearest hundred

584 + 326 = 

What is about 900

584 rounds to 600

326 rounds to 300

300

146 + 86 + 53 = 

What is 285

300


Which digit is in the hundreds place in 807?




8



400

Use PARTIAL SUMS to find the sum of

475 + 264 = 

What is 739

400 + 70 + 5 

200 + 60 + 4

400

Use PARTIAL DIFFERENCES to find the difference of

349 - 98 = 

What is 251

349 - 40 = 309

309 - 50 = 259

259 - 8 = 251

400

Estimate the difference by rounding to the nearest ten

306 - 108 = 

What is about 200

306 rounds to 310

108 rounds to 110

400

125 + 224 + 306 = 

What is 655

400


In 537-49, do you need to regroup?




yes



500

Use PARTIAL SUMS to find the sum of

137 + 248 = 

What is 385

100 + 30 + 7

200 + 40 + 8

500

Use PARTIAL DIFFERENCES to find the difference of

873 - 184 =

What is 689

873 - 100 = 773

773 - 70 = 703

703 - 10 = 693

693 - 3 = 690    690 - 1 = 689

500

Estimate the difference by rounding to the nearest ten

863 - 526 = 


What is about 330

863 rounds to 860

526 rounds to 530

500

124 + 235 + 85 = 

What is 444

500


In 728-639, how many times do you need to regroup?



 


2