Multiplying Decimals Quiz

Grade 5 · Math · Quiz

Test your decimal multiplication skills with these mixed problems.

Questions

1. What is 0.3 × 0.9?

   1. 0.27
   2. 2.7
   3. 0.027
   4. 27
   Show answer

   Answer: 0.27

   3 × 9 = 27. Total 2 decimal places. Answer: 0.27.

2. What is 4.2 × 5?

   1. 2.10
   2. 21.0
   3. 210
   4. 0.210
   Show answer

   Answer: 21.0

   42 × 5 = 210. One decimal place. Answer: 21.0.

3. What is 0.12 × 0.4?

   1. 0.48
   2. 0.048
   3. 4.8
   4. 0.0048
   Show answer

   Answer: 0.048

   12 × 4 = 48. Total 3 decimal places. Answer: 0.048.

4. What is 2.5 × 10?

   1. 0.25
   2. 25
   3. 250
   4. 2500
   Show answer

   Answer: 25

   Multiply by 10: move decimal 1 place right. 2.5 → 25.

5. What is 0.08 × 0.5?

   1. 0.04
   2. 0.004
   3. 4.0
   4. 0.40
   Show answer

   Answer: 0.04

   8 × 5 = 40. Total 3 decimal places. 0.040 = 0.04.

6. 0.9 × 0.9 = ___

   Show answer

   Answer: 0.81

   9 × 9 = 81. Two decimal places. Answer: 0.81.

7. 1.4 × 1.2 = ___

   Show answer

   Answer: 1.68

   14 × 12 = 168. Two decimal places. Answer: 1.68.

8. 0.25 × 100 = ___

   Show answer

   Answer: 25

   Move decimal 2 places right. 0.25 → 25.

9. Sarah earns $8.50 per hour. She works 3.5 hours. How much does she earn?

   1. $29.75
   2. $28.00
   3. $29.50
   4. $30.00
   Show answer

   Answer: $29.75

   8.50 × 3.5: 850 × 35 = 29750, 3 decimal places → $29.750 = $29.75.

10. Which best estimates 4.8 × 3.2?

    1. About 12
    2. About 15
    3. About 20
    4. About 8
    Show answer

    Answer: About 15

    Round to 5 × 3 = 15. (Exact answer: 15.36, so 'about 15' is correct.)

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