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Mental Math
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Review ( +, - )
x 10, 100, 1000
100
.2 x .9
What is .18
100
5.7 x 0.06
What is .342
100
2.9 + .56
What is 3.46
100

0.009 x 10

What is 0.09

200
.1 x .4
What is .04
200
7.6 x 0.8
What is 6.08
200
1.69 + 15
What is 16.69
200

0.45 x 100

What is 45

300
.7 x .9
What is .63
300

6.3 x 5

What is 31.5?

300
6.5-2.8
What is 3.7
300

3.1 x 1,000

What is 3,100

400
.25 x 4
What is 1
400
0.38 x 0.75
What is .285
400
9.4-6.48
What is 2.92
400

0.062 x 100

What is 6.2?

500
.05 x 0.6
What is .030 or .03
500
1.68 x .50
What is 0.84
500

12.88 - 6.42

What is 6.46?

500

2.89 x 10

What is 28.9?