Show:
Addition Properties
Estimating Sums
Estimating Differences
Rounding
100

What property is this problem using?

7+12 = 12+7

commutative

100

Estimate to the nearest ten:

47 + 36 + ____

50 + 40 = 90

100

Estimate to the nearest ten:

74 - 38 = _____

70 - 40 = 30

100

Round to the nearest ten:

82

80

200

What property is the problem using?

(4+6) + 8 = 4 + (6+8)

associative

200

Estimate to the nearest ten:

62 + 29 = _____

60 + 30 = 90

200

Estimate to the nearest ten:

91 - 46 = _____

90 - 50 = 40

200

Round to the nearest ten:

729

730

300

What property is the problem using?

25 + 0 = 25

identity

300

Estimate to the nearest hundred:

348 + 261 = _____

300 + 300 = 600

300

Estimate to the nearest hundred:

583 - 241 = ______

580 - 240 = 340

300

Round to the nearest hundred:

128

100

400

Write in the missing number:

(18+27) + 14 = 18 + (27 + ___)

14

400

Estimate to the nearest hundred:

572 + 319 = ______

600 + 300 = 900

400

Estimate to the nearest hundred:

726 - 318 = _______

730 - 320 = 410

400

Round to the nearest hundred: 

486

500

500
Write in the missing number:

24 + 35 = 35 + ____

24

500

Estimate to the nearest hundred:

684 + 247 = _______

700 + 200 = 900

500

Estimate to the nearest hundred:

849 - 376 = ______

800 - 400 = 400

500

Round to the nearest hundred:

673

700