Lesson 3 - Decimal Quiz

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Lesson 3 - Decimal Quiz - Quiz

Rounding to decimal places10 Multiple Choice Questions


Questions and Answers
  • 1. 

    Round to 1 decimal place0.33 + 0.23 

    • A.

      0.6

    • B.

      1.5

    • C.

      2.33

    • D.

      1.45

    Correct Answer
    A. 0.6
    Explanation
    The given question asks to round the sum of 0.33 and 0.23 to 1 decimal place. Adding 0.33 and 0.23 gives a sum of 0.56. When rounding to 1 decimal place, we look at the digit in the second decimal place, which is 6. Since 6 is greater than or equal to 5, we round up the first decimal place, resulting in the answer of 0.6.

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  • 2. 

    Calculate to 1 decimal place0.49 + 0.29995

    • A.

      0.6

    • B.

      0.8

    • C.

      0.89

    • D.

      3.44

    Correct Answer
    B. 0.8
    Explanation
    The correct answer is 0.8 because when we add 0.49 and 0.29995, we get a sum of 0.78995. Rounding this to one decimal place gives us 0.8.

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  • 3. 

    Calculate to 2 decimal places1.22222 + 1.333333

    • A.

      2.55

    • B.

      2.22

    • C.

      3.22

    • D.

      1.23

    Correct Answer
    A. 2.55
    Explanation
    The given question asks to calculate the sum of 1.22222 and 1.333333 to 2 decimal places. When we add these two numbers, we get 2.555553. However, since we need to round the answer to 2 decimal places, we round it to 2.56. Therefore, the correct answer is 2.56.

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  • 4. 

    Calculate to 2 decimal places2.11432 + 2.220124

    • A.

      2.22

    • B.

      4.33

    • C.

      3.22

    • D.

      2.45

    Correct Answer
    B. 4.33
    Explanation
    The correct answer is 4.33 because when we add 2.11432 and 2.220124 together and round to two decimal places, we get 4.33.

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  • 5. 

    Calculate to 2 decimal places2.89 + 0.10

    • A.

      0.89

    • B.

      3.22

    • C.

      2.99

    • D.

      5.1

    Correct Answer
    C. 2.99
    Explanation
    When we add 2.89 and 0.10, we get a sum of 2.99.

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  • 6. 

    Calculate to 3 decimal places 5.44678

    • A.

      5.447

    • B.

      5.55

    • C.

      5.467

    • D.

      5.446

    Correct Answer
    A. 5.447
    Explanation
    The given question asks to calculate 5.44678 to 3 decimal places. To do this, we look at the fourth decimal place, which is 6. Since 6 is greater than or equal to 5, we round up the third decimal place, which is 4, to 5. Therefore, the correct answer is 5.447.

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  • 7. 

    Which number correctly shows 98.9995 to 2 dp?

    • A.

      99.00

    • B.

      98.99

    • C.

      98.999

    • D.

      98.100

    Correct Answer
    A. 99.00
    Explanation
    The number 98.9995 rounded to 2 decimal places is 99.00. This is because when rounding to 2 decimal places, we look at the third decimal place. If it is 5 or greater, we round up the second decimal place. In this case, the third decimal place is 9, so we round up the second decimal place from 9 to 0, resulting in 99.00.

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  • 8. 

    Which correctly shows 32.459 to 1 dp?

    • A.

      32.5

    • B.

      32.46

    • C.

      32.45

    • D.

      32.459

    Correct Answer
    A. 32.5
    Explanation
    The correct answer is 32.5 because rounding 32.459 to 1 decimal place means that we only consider the first decimal digit after the decimal point. Since the digit 5 is greater than or equal to 5, we round up the previous digit, which is 2, to 3. Therefore, the number becomes 32.5.

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  • 9. 

    Which numbers shows 8.991253 to 4 dp?

    • A.

      8.9913

    • B.

      8.9912

    • C.

      8.9915

    • D.

      8.9910

    Correct Answer
    A. 8.9913
    Explanation
    The question asks for the number that represents 8.991253 to 4 decimal places. To round to 4 decimal places, we look at the fifth decimal place (3 in this case). If the fifth decimal place is 5 or greater, we round up the fourth decimal place. Since the fifth decimal place is 3, which is less than 5, we do not round up. Therefore, the correct answer is 8.9913.

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  • 10. 

    Which number correctly shows Pi expressed to 4 dp?

    • A.

      3.1429

    • B.

      3.14

    • C.

      3.1

    • D.

      3.14285

    Correct Answer
    A. 3.1429
    Explanation
    The number 3.1429 correctly shows Pi expressed to 4 decimal places. Pi is an irrational number with an infinite number of decimal places, but when rounded to 4 decimal places, it becomes 3.1429.

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  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Mar 14, 2015
    Quiz Created by
    Mgtb
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