Decimal Multiplication and Division Quiz

Grade 5 · Math · Quiz

Test your ability to multiply and divide decimal numbers correctly.

Questions

1. What is 2.5 x 0.4?

   1. 10
   2. 1.0
   3. 0.10
   4. 100
   Show answer

   Answer: 1.0

   Multiply 25 x 4 = 100, then count 2 total decimal places (1 from 2.5, 1 from 0.4) to get 1.0, which equals 1.

2. What is 9.6 ÷ 4?

   1. 24
   2. 2.4
   3. 0.24
   4. 240
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   Answer: 2.4

   Place the decimal point in the quotient above the one in 9.6, then divide 96 ÷ 4 = 24, giving 2.4.

3. To solve 6.3 ÷ 0.7, you can first rewrite this as:

   1. 63 ÷ 7
   2. 0.63 ÷ 7
   3. 6.3 ÷ 7
   4. 630 ÷ 7
   Show answer

   Answer: 63 ÷ 7

   Multiply both dividend and divisor by 10 to clear the decimal from 0.7: 6.3 x 10 = 63 and 0.7 x 10 = 7, giving 63 ÷ 7.

4. How many decimal places should be in the product of 3.14 x 2.5?

   1. 1
   2. 2
   3. 3
   4. 4
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   Answer: 3

   3.14 has 2 decimal places and 2.5 has 1 decimal place. 2 + 1 = 3 total decimal places in the product.

5. A ribbon is 4.8 meters long. It is cut into pieces that are each 0.6 meters. How many pieces are there?

   1. 2.88
   2. 0.8
   3. 8
   4. 80
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   Answer: 8

   4.8 ÷ 0.6: multiply both by 10 to get 48 ÷ 6 = 8 pieces.

6. What is 0.25 x 0.4?

   1. 1.0
   2. 0.10
   3. 0.010
   4. 0.100
   Show answer

   Answer: 0.10

   Multiply 25 x 4 = 100, then count 3 total decimal places (2 from 0.25, 1 from 0.4) to get 0.100 = 0.10.

7. The quotient of 3.5 ÷ 0.5 is the same as 35 ÷ 5.

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   Answer: True

   Multiplying both 3.5 and 0.5 by 10 gives 35 and 5. The ratio is preserved, so the quotient is the same: 7.

8. 12.6 ÷ 3 = ___

   Show answer

   Answer: 4.2

   Place the decimal above the one in 12.6, then divide 126 ÷ 3 = 42, giving 4.2.

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