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Addition Properties and Subtraction Rules
Mental Math Strategies
Estimate Sums and Differences
Adding and Subtracting
Mixed Review
100
Which rule/property is shown? 7 + 0 = 0
Zero Property of Addition.
100
Solve using the "breaking apart" method. 44 + 18
44 = 40 + 4 18 = 10 + 8 40 + 10 = 50 4 + 8 = 12 50 + 12 = 62
100
Round to the nearest ten. Then estimate. 526 + 313
840
100
$652.00 + $145.00
$797.00
100
605 - 94
511
200
Which rule/property is shown? 5 + 7 = 12 7 + 5 = 12
Commutative Property of Addition.
200
Solving using the "breaking apart" method. 58 - 25
58 = 50 + 8 25 = 20 + 5 50 - 20 = 30 8 - 5 = 3 30 + 3 = 33
200
Round each number to the nearest ten. Then estimate. 3,550 - 1,743
1,810
200
7,927 - 2,639
5,288
200
FREE 200 POINTS! Go again!
FREE 200 POINTS! Go again!
300
Which rule/property is shown? (3 + 5) + 6 = 3 + (5 + 6)
Associative Property of Addition
300
Solve using the "compensation" method. 38 + 56
40 + 56 = 96 - 2 =94
300
Round each number to the nearest hundred or the nearest dollar. Then estimate. 4,444 - 3,858
500
300
2,004 - 1,413
591
300
Solve. Tell which property you used. (7 - 0) + 3 = ___ + 3
7; Zeros in Subtraction
400
Which rule/property is shown? 7 - 0 = 7 7 - 7 = 0
Zeros in subtraction.
400
Solve using the "compensation" method. 145 - 17
145 - 20 = 125 + 3 =128
400
Round each number to the nearest hundred or the nearest dollar. Then estimate. $34.99 + $96.78
$132.00
400
$235.74 + $20.97
$256.71
400
One mural requires 37,200 ears of corn. A different mural requires 30,100 ears. How many ears of corn are needed for both murals?
67,300 ears of corn
500
Complete each number sentence and tell which property you used. 24 + (7 + 8) = (24 + 7) + _____
8; Associative Property of Addition
500
Use mental math to add and tell which strategy you used. 212 + 107
319
500
Round each number to the nearest hundred or the nearest dollar. Then estimate. 359,513 + 233,642
593,100
500
843,_02 - 564,763 = 278,239
0
500
<,> or = 52,648 + 1,690 ____ 83,141 - 19,302
54,338 > 63,839