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Mental Math
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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

A batch of cookies weighs 8.9 oz. What is the weight of 5.5 batches of cookies?

What is 48.95 oz? 

100

254.8 x 1,000

What is 254,800

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

A pound of grapes cost $2.09. I bought 3.4 pounds.  How much did I spend on grapes? 

What is $7.106? 

200

To place a decimal in the product, you count places from left to right. True or False.

What is False? 

300
.7 x .9
What is .63
300
1.63 x 5.4
What is 8.802
300
6.5-2.8
What is 3.7
300

A bottle of soda had 2.36 of the daily recommended sugar. If you were to drink 0.7 of the bottle, how much of the daily recommend sugar would you have drank?

What is 1.652? 

300

George needs to change 0.02 to a whole number. How does he do this? (Do not tell me to move the decimal 2 places to the right!)

What is multiply by 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

An old road was 3.9 miles long. After a renovation it was 3.7 times as long. How long was the road after the renovation?

What is 14.43 miles?

400

If 4.38 × 7.97 = 349086, the decimal should be placed between the 4 and 9 (assume the product is correct).  True or False. 

What is True?

500
.05 x 0.6
What is .030 or .03
500

0.45 x 9.1 

What is 4.095?

500
10-.368
What is 9.632
500

It costs the Barker family $95.49 a month to feed their two Great Dane dogs. How much will it cost them for 6.5 months of food?

What is $620.69?

500

What is the value of n? 

0.1 x n = 27.9

What is 279?