# Operations With Rational Numbers

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Psdrake
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Mathematical operations with decimals and percents.

• 1.

### 45.17 + 327.19 =

• A.

37.92

• B.

372.96

• C.

778.9

B. 372.96
Explanation
The correct answer is 372.96 because when we add 45.17 and 327.19 together, we get a sum of 372.36.

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• 2.

### 58.49 x 22.118 =

• A.

1293.68182

• B.

12936.8182

• C.

129.37

A. 1293.68182
Explanation
The correct answer is 1293.68182. This can be obtained by multiplying 58.49 by 22.118.

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• 3.

### 457.89 - 32.74 =

• A.

13.15

• B.

425.15

• C.

490.63

B. 425.15
Explanation
The correct answer is 425.15. This is the result of subtracting 32.74 from 457.89.

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• 4.

### 210.45 / .05 =

• A.

42.90

• B.

420.9

• C.

4209

C. 4209
Explanation
The given expression is a division problem, where 210.45 is divided by 0.05. To solve this, we can move the decimal point of 0.05 two places to the right to make it a whole number, which becomes 5. Then, we divide 210.45 by 5, resulting in 42.09. Therefore, the correct answer is 4209.

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• 5.

### How could you find 15% of \$72.00

• A.

Convert 15% to the decimal .15 and multiply \$7.20 times .15.

• B.

10% of \$72.00 is \$7.20 plus 5% of \$72.00 is half of 10%, so \$7.20 plus \$3.60 equals \$10.80.

• C.

Find 1% of \$72.00 which is .72 and multiply by 15.

• D.

A

• E.

A and B

• F.

All of the above.

F. All of the above.
Explanation
The explanation for the correct answer "All of the above" is that all three options mentioned in the answer are valid methods to find 15% of \$72.00.

Option A suggests converting 15% to the decimal .15 and multiplying it with \$72.00, which gives the result \$10.80.

Option B breaks down 15% into 10% and 5%. It calculates 10% of \$72.00 as \$7.20 and then adds half of 10% (which is 5%) of \$72.00, resulting in \$10.80.

Option C suggests finding 1% of \$72.00, which is \$0.72, and then multiplying it by 15, giving the same result of \$10.80.

Therefore, all three methods yield the correct answer of \$10.80, making "All of the above" the correct choice.

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• Current Version
• Mar 21, 2023
Quiz Edited by
ProProfs Editorial Team
• Nov 08, 2010
Quiz Created by
Psdrake

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