Missing Number
? + 61 = 61
0 is the missing number.
Estimate by rounding to the nearest 10:
236 + 139 = ?
380
(240 + 140 = 380)
17 + 0 = 17
The Identity Property of Addition.
Jimmy ran for 122 minutes on Monday and Tuesday. Cassidy ran for 345 minutes on Monday, Tuesday, and Wednesday. How many minutes did they run in all on Monday?
467
(122 + 345 = 467)
Use partial sums to add:
356 + 239 = ?
595
(500 + 90 + 5 = 595)
32 + 98 = ? + 32
98 is the missing number.
Estimate by rounding to the nearest 100:
534 + 348 = ?
800
(500 + 300 = 800)
52 + 83 = 83 + 52
The Commutative Property of Addition.
Ms. Stevens bought two sweaters for $48 each and pair of jeans for $36. How much money did Ms. Stevens spend for the clothes?
$132
($48 + $48 + $36 = $132)
Add:
418 + 256 = ?
674
(85 + 36) + 3 = 85 (? + 3)
36 is the missing number.
Estimate by rounding to the nearest 10:
387 + 564 = ?
950
(390 + 560 = 950)
(64 + 22) + 2 = 64 + (22 + 2)
The Associative Property of Addition.
The top two levels of a parking garage each have 168 parking spaces. The bottom level has 40 more parking spaces than either of the top two levels. How many parking spaces are there in all?
544 parking spaces.
(168 + 168) + (168 + 40) = 544
Use partial sums to add:
618 + 184 = ?
802
(700 + 90 + 12 = 802)
1,000 + 19 + 476 = 1,000 + ? + 19
476 is the missing number.
Estimate by rounding to the nearest 100:
483 + 436 = ?
900
(500 + 400 = 900)
(38 + 50) + 4 = (50 + 38) + 4
The Commutative Property of Addition.
Cesar said the estimated sum of rounding each addend of 348 + 237 to the nearest hundred is 600. Is Cesar correct? Explain why or why not.
Cesar is incorrect.
348 rounds to 300 and 237 rounds to 200 and 300 + 200 = 500.
Add:
335 + 492 = ?
827
? + 42 + 53 = 42 + 53
0 is the missing number.
Estimate by rounding to the nearest 10:
555+ 790 = ?
1,350
(560 + 790 = 1,350)
10 + 3 = 0 + (10 + 3)
The Identity Property of Addition.
Doug does 122 sit-ups on Monday. He does 25 more sit-ups on Tuesday than he does on Monday. How many sit-ups does Doug do in total on both days?
Doug does 269 sit-ups in total on both days.
Add:
186 + 231 + 192 = ?
609