Partial Sums
Using Expanded Form
Using Expanded Form
Use PARTIAL SUMS to find the sum of
135 + 152 =
What is 287
100 + 30 + 5
100 + 50 + 2
Use PARTIAL DIFFERENCES to find the difference of
489 - 253 =
What is 236
489-200 = 289
289 - 50 = 239
259 - 3 = 236
Estimate the sum by rounding to the nearest ten
236 + 217 =
What is about 460
236 rounds to 240
217 rounds to 220
209 + 48 + 312 =
What is 569
In 539 which digit is in the tens place?
3
Use PARTIAL SUMS to find the sum of
650 + 138 =
What is 788
600 + 50 + 0
100 + 30 + 8
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
Estimate the sum by rounding to the nearest ten
407 + 436 =
What is about 850
407 rounds to 410
436 rounds to 440
412 + 273 + 139 =
What is 824
In 729, which digit is in the ones place?
9
Use PARTIAL SUMS to find the sum of
535 + 423 =
What is 958
500 + 30 + 5
400 + 20 + 3
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
Estimate the sum by rounding to the nearest hundred
584 + 326 =
What is about 900
584 rounds to 600
326 rounds to 300
146 + 86 + 53 =
What is 285
Which digit is in the hundreds place in 807?
8
Use PARTIAL SUMS to find the sum of
475 + 264 =
What is 739
400 + 70 + 5
200 + 60 + 4
Use PARTIAL DIFFERENCES to find the difference of
349 - 98 =
What is 251
349 - 40 = 309
309 - 50 = 259
259 - 8 = 251
Estimate the difference by rounding to the nearest ten
306 - 108 =
What is about 200
306 rounds to 310
108 rounds to 110
125 + 224 + 306 =
What is 655
In 537-49, do you need to regroup?
yes
Use PARTIAL SUMS to find the sum of
137 + 248 =
What is 385
100 + 30 + 7
200 + 40 + 8
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
Estimate the difference by rounding to the nearest ten
863 - 526 =
What is about 330
863 rounds to 860
526 rounds to 530
124 + 235 + 85 =
What is 444
In 728-639, how many times do you need to regroup?
2