Math 090 Decimals Quiz

1. To add or subtract decimals, you must line up the decimal points.

True

False

Depends

When adding or subtracting decimals, it is necessary to line up the decimal points in order to correctly calculate the result. This is because the decimal point represents the position of the fractional part of the number. By aligning the decimal points, we ensure that the corresponding digits in each decimal place are being added or subtracted accurately.

Explanation

When adding or subtracting decimals, it is necessary to line up the decimal points in order to correctly calculate the result. This is because the decimal point represents the position of the fractional part of the number. By aligning the decimal points, we ensure that the corresponding digits in each decimal place are being added or subtracted accurately.

2. What is 13 - 6.87?

0.613

613

None of these

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Explanation

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3. What is 2.5 X .88?

2.2

2.67

None of these

The correct answer is 2.2 because when you multiply 2.5 by 0.88, you get 2.2.

Explanation

The correct answer is 2.2 because when you multiply 2.5 by 0.88, you get 2.2.

4. Multiply (1.3)(2.4)(6.8)

21.216

212.16

None of these

The given question asks to multiply three numbers: 1.3, 2.4, and 6.8. Multiplying these numbers together gives the result of 21.216.

Explanation

The given question asks to multiply three numbers: 1.3, 2.4, and 6.8. Multiplying these numbers together gives the result of 21.216.

5. What is 5.25 divided by .05?

10.5

105

None of these

When dividing 5.25 by 0.05, we can think of it as moving the decimal point two places to the right in both numbers. This gives us 525 divided by 5, which equals 105. Therefore, the correct answer is 105.

Explanation

When dividing 5.25 by 0.05, we can think of it as moving the decimal point two places to the right in both numbers. This gives us 525 divided by 5, which equals 105. Therefore, the correct answer is 105.

6. Convert 5 3/5 into a decimal.

0.6

5.6

None of these

To convert a mixed number into a decimal, we first multiply the whole number by the denominator of the fraction and then add the numerator. In this case, we multiply 5 by 5 (denominator of 3/5) and get 25. Then we add the numerator 3 to get 28. Finally, we divide 28 by the denominator 5 to get the decimal form, which is 5.6.

Explanation

To convert a mixed number into a decimal, we first multiply the whole number by the denominator of the fraction and then add the numerator. In this case, we multiply 5 by 5 (denominator of 3/5) and get 25. Then we add the numerator 3 to get 28. Finally, we divide 28 by the denominator 5 to get the decimal form, which is 5.6.

7. Round 34.657 to the nearest tenths place.

34.7

34.66

None of these

When rounding a number to the nearest tenth place, we look at the digit in the hundredth place. If it is 5 or greater, we round up. If it is less than 5, we round down. In this case, the digit in the hundredth place is 6, which is greater than 5. Therefore, we round up the digit in the tenths place, which is 4, to the next higher number, which is 7. So the correct answer is 34.7.

Explanation

When rounding a number to the nearest tenth place, we look at the digit in the hundredth place. If it is 5 or greater, we round up. If it is less than 5, we round down. In this case, the digit in the hundredth place is 6, which is greater than 5. Therefore, we round up the digit in the tenths place, which is 4, to the next higher number, which is 7. So the correct answer is 34.7.