Operations on decimals (AQA GCSE Maths): Quizzes

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Operations on decimals
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What is the most important rule when adding or subtracting decimal numbers?

Line up decimal points vertically

What can you add to decimals to help with alignment? E.g., 3.50.213.5 - 0.21 becomes 3.500.213.50 - 0.21

Zeros to the end

Calculate: 12.75+8.612.75 + 8.6

21.3521.35

When multiplying decimals, what should you do with the decimal points during calculation?

Ignore them initially

In 8.69×128.69 \times 12, how many decimal places should the final answer have?

22 decimal places

Calculate: 8.69×128.69 \times 12

104.28104.28

What is the key step when dividing by a decimal number?

Convert divisor to whole number

For 40.6÷1.440.6 \div 1.4, what should you multiply both numbers by to make the divisor whole?

1010

Calculate: 40.6÷1.440.6 \div 1.4

2929

Why should you use estimation when working with decimal operations?

To check answers are reasonable

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