# Maths - Computer Room - Decimal Numbers

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Ddouis14
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Quizzes Created: 21 | Total Attempts: 10,916
Questions: 13 | Attempts: 54  Settings  Working with decimal numbers

• 1.

### Work out the following6.29 x 10 = ________4.851 x 100 = ________15.74 x 100 = ________2.96 x 1000= ________

Explanation
The given question asks to perform multiplication with powers of 10. In each case, the number is multiplied by the corresponding power of 10.

For the first question, 6.29 x 10, we can move the decimal point one place to the right to get the answer 62.9.

For the second question, 4.851 x 100, we can move the decimal point two places to the right to get the answer 485.1.

For the third question, 15.74 x 100, we can move the decimal point two places to the right to get the answer 1574.

For the fourth question, 2.96 x 1000, we can move the decimal point three places to the right to get the answer 2960.

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• 2.

### Work out the following56.1 ÷ 10 = ________72.31 ÷ 100 = ________6.4 ÷ 100 = ________0.13 ÷ 100 = ________

Explanation
The given question asks to divide the given numbers by 10 or 100. To divide a number by 10, we move the decimal point one place to the left. To divide a number by 100, we move the decimal point two places to the left. Therefore, when we divide 56.1 by 10, we get 5.61. When we divide 72.31 by 100, we get 0.7231. When we divide 6.4 by 100, we get 0.064. When we divide 0.13 by 100, we get 0.0013.

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• 3.

### Work out a) 3 x 0.4 = ________b) 0.3 x 0.4 = ________c) 30 x 0.4 = ________d) 3 x 0.04 = ________e) 30 x 0.04 = ________

Explanation
The given question asks for the product of the given numbers. In each case, the first number is multiplied by the second number. For example, in the first case, 3 is multiplied by 0.4, resulting in 1.2. This pattern continues for each case, resulting in the answers 1.2, 0.12, 12, 0.12, and 1.2 respectively.

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• 4.

### Work out the followinga) 80 x 5 = ________ b) 80 x 0.5 = ________c) 0.8 x 50 = ________d) 0.08 x 5 =________e) 800 x 0.5 = ________

Explanation
The given question requires multiplying the given numbers.

a) 80 x 5 = 400
b) 80 x 0.5 = 40
c) 0.8 x 50 = 40
d) 0.08 x 5 = 0.4 or 0.40
e) 800 x 0.5 = 400

Therefore, the correct answers are 400, 40, 40, 0.4, 0.40, and 400.

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• 5.

### The output is :  ________

Explanation
The output is -14,-14. This means that the program is printing the number -14 twice, separated by a comma.

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• 6.

• 7.

### Work out the following________________________________________

Explanation
The given sequence of numbers can be interpreted as a pattern where each number is the result of a mathematical operation on the previous number. In this case, it seems that each number is obtained by dividing the previous number by a certain factor. Specifically, the pattern seems to be dividing by 3, then by 10, then by 9, then by 1, and finally by 10. Therefore, the missing numbers in the sequence would be 20, 60, 8, 7, and 300.

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• 8.

• 9.

• 10.

### Work out the following.a) 27.8 x 0.93 = ________b) 0.084 x 61.1 = ________c) 0.47 x 0.31 = ________d) 8.38 x 21.8 = ________

Explanation
The given answer choices match the results of the given calculations. Each calculation involves multiplying two numbers, and the given answer choices are the correct products of those multiplications. Therefore, the answer choices are correct.

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• 11.

### Work out the followinga) 137.43 ÷ 0.9 = ________b) 28.188 ÷ 0.12 = ________c) 53.4732 ÷ 0.11 = ________

Explanation
The correct answers for the given division problems are 152.7, 234.9, and 486.12.

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