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Estimating/metric system
add/sub decimals
multiply/divide decimals
add/sub integers
multiply/divide integers
100
Round to the nearest whole number 45.79
What is 46
100
12.02 + 15.90
What is 27.92
100
2.4 x 3
What is 7.2
100
-5 + 12
What is 7
100
-2 x -3
What is 6
200
Round to the nearest tenth 102.34
What is 102.3
200
134.49 - 100.64
What is 33.85
200
67.1 x 1.3
What is 87.23
200
-12 + 40
What is 28
200
-25 / -5
What is 5
300
Round to the nearest hundredth 4.0284
What is 4.03
300
31.2 + 88.91
What is 120.11
300
255 / .5
What is 510
300
115 + -35
What is 80
300
-12 x 14
What is -168
400
Use front end estimation: 3.45 + 2.12 + 6.89 + 4.32
What is $17
400
3 + 4.56 + 19.224
What is 26.784
400
10.35 / 0.23
What is 45
400
-20 - (-15)
What is -5
400
-425 / 25
What is -17
500
Use compatible numbers 13.24 divided by 6.13
What is 2
500
10 - 4.882
What is 5.118
500
3.611 / 4.6
What is .785
500
-113 - 120
What is -233
500
-2 x -3 x -4 x -2
What is 48