Operations on decimals (Edexcel GCSE Maths): Quizzes

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

Align the decimal points vertically

Why should you write 1.61.6 as 1.601.60 when adding it to 0.750.75?

Makes alignment clearer and reduces errors

What is 0.75+1.60.75 + 1.6?

2.352.35

What is 3.50.213.5 - 0.21?

3.293.29

When multiplying decimals, how do you place the decimal point in your answer?

Count total decimal places in both numbers

What is 8.5×0.048.5 × 0.04?

0.340.34

Why estimate 9×12=1089 × 12 = 108 when calculating 8.69×128.69 × 12?

To check decimal point placement

When dividing 40.6÷1.440.6 ÷ 1.4, what should you do first?

Multiply both numbers by 10

What is 40.6÷1.440.6 ÷ 1.4?

2929

What is described as a common source of errors in decimal operations?

Decimal point placement

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