Addition Properties
What property is this problem using?
7+12 = 12+7
commutative
Estimate to the nearest ten:
47 + 36 + ____
50 + 40 = 90
Estimate to the nearest ten:
74 - 38 = _____
70 - 40 = 30
Round to the nearest ten:
82
80
What property is the problem using?
(4+6) + 8 = 4 + (6+8)
associative
Estimate to the nearest ten:
62 + 29 = _____
60 + 30 = 90
Estimate to the nearest ten:
91 - 46 = _____
90 - 50 = 40
Round to the nearest ten:
729
730
What property is the problem using?
25 + 0 = 25
identity
Estimate to the nearest hundred:
348 + 261 = _____
300 + 300 = 600
Estimate to the nearest hundred:
583 - 241 = ______
580 - 240 = 340
Round to the nearest hundred:
128
100
Write in the missing number:
(18+27) + 14 = 18 + (27 + ___)
14
Estimate to the nearest hundred:
572 + 319 = ______
600 + 300 = 900
Estimate to the nearest hundred:
726 - 318 = _______
730 - 320 = 410
Round to the nearest hundred:
486
500
24 + 35 = 35 + ____
24
Estimate to the nearest hundred:
684 + 247 = _______
700 + 200 = 900
Estimate to the nearest hundred:
849 - 376 = ______
800 - 400 = 400
Round to the nearest hundred:
673
700