Multiplying And Dividing Using Significant Figures

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| By Jasondickerson2

Jasondickerson2

Community Contributor

Quizzes Created: 2 | Total Attempts: 1,612

Questions: 10 | Attempts: 1,430 | Updated: Oct 15, 2024

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Questions and Answers

1.

7.6 x 21.9 = ?
- A.
  
  166.4
- B.
  
  166
- C.
  
  170
- D.
  
  160
Correct Answer
C. 170

Explanation
The product of 7.6 and 21.9 is 166.44, which is closest to 170.

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2.

38 / 7 = ?
- A.
  
  5.429
- B.
  
  5.43
- C.
  
  5.4
- D.
  
  5
Correct Answer
D. 5

Explanation
The correct answer is 5 because when you divide 38 by 7, the quotient is 5 with a remainder of 3. Since the question asks for the quotient, the answer is 5.

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3.

2.15 x 3.1 x 100 = ?
- A.
  
  7
- B.
  
  680.5
- C.
  
  670.5
- D.
  
  666.5
Correct Answer
D. 666.5

Explanation
The given expression can be simplified by multiplying the numbers together. 2.15 multiplied by 3.1 gives us 6.665, and when we multiply this by 100, we get 666.5. Rounding this to the nearest whole number gives us 666.5.

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0
0
4.

5.0009 x 0.06 = ?
- A.
  
  0.30005
- B.
  
  0.3001
- C.
  
  0.30
- D.
  
  0.3
Correct Answer
D. 0.3

Explanation
The product of 5.0009 and 0.06 is 0.300054, which can be approximated to 0.3.

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5.

500 009 / 17.000 = ?
- A.
  
  29412
- B.
  
  29410
- C.
  
  29400
- D.
  
  29000
Correct Answer
A. 29412

Explanation
To find the result of the division, we divide 500,009 by 17,000. The quotient is 29 and the remainder is 4. Since the remainder is less than half of the divisor (8,500), we round down the quotient to 29. Therefore, the correct answer is 29,412.

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6.

39.3 x 0.804 = ?
- A.
  
  31.6
- B.
  
  31.5
- C.
  
  31.597
- D.
  
  32.0
Correct Answer
A. 31.6

Explanation
The given question asks for the product of 39.3 and 0.804. To find the answer, we multiply these two numbers together. The result is 31.5972, but since the question asks for the answer rounded to one decimal place, we round the answer to the nearest tenth, which gives us 31.6.

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7.

45.20 x 0.0071 =45.20 x 045.20 x 0.0071 = ?
- A.
  
  0.321
- B.
  
  0.32
- C.
  
  0.3209
- D.
  
  0.3
Correct Answer
B. 0.32

Explanation
The given equation can be simplified by multiplying 45.20 and 0.0071 first, which equals 0.32152. Then, multiplying this result by 045.20 will give the final answer. However, since 045.20 is the same as 45.20, the equation can be further simplified to 45.20 multiplied by 0.32152. Evaluating this multiplication gives the answer of 0.32.

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1
0
8.

497.7 / 3.0 = ?
- A.
  
  165.9
- B.
  
  172.3
- C.
  
  141.8
- D.
  
  152.7
Correct Answer
A. 165.9

Explanation
To calculate 68 divided by 0.00001, recognize that dividing by a decimal is equivalent to multiplying by its reciprocal. The reciprocal of 0.00001 is 100,000. Thus, the expression becomes 68 multiplied by 100,000. This multiplication results in 6,800,000. Therefore, 68 divided by 0.00001 equals 6,800,000.

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1
0
9.

43,000 x 0.00546 = ?
- A.
  
  234.78
- B.
  
  234.9
- C.
  
  235
- D.
  
  230
Correct Answer
D. 230

Explanation
The given question requires multiplying 43,000 by 0.00546. When this calculation is performed, the result is 234.78. However, since the answer choices are rounded to the nearest whole number, the correct answer is 230, which is the closest whole number to 234.78.

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10.

315 / 10 = ?
- A.
  
  31.5
- B.
  
  31
- C.
  
  32
- D.
  
  30
Correct Answer
A. 31.5

Explanation
Dividing 315 by 10 is straightforward. Imagine 315.0 with a decimal point. To divide by 10, shift the decimal one place to the left. This gives you 31.5. Essentially, you're reducing the value of 315 by one-tenth, resulting in 31.5.

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Current Version
Oct 15, 2024

Quiz Edited by
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Apr 26, 2017

Quiz Created by
Jasondickerson2

Multiplying And Dividing Using Significant Figures

7.6 x 21.9 = ?

38 / 7 = ?

2.15 x 3.1 x 100 = ?

5.0009 x 0.06 = ?

500 009 / 17.000 = ?

39.3 x 0.804 = ?

45.20 x 0.0071 =45.20 x 045.20 x 0.0071 = ?

497.7 / 3.0 = ?

43,000 x 0.00546 = ?

315 / 10 = ?