Add and Subtract Two Decimal Place Numbers | KS3 Maths Resources

What you need to know

Things to remember:

• We can split up our numbers into “whole number” and “decimal parts”, adding and subtracting separately.
• Adding a negative is the same as subtracting.

We can add and subtract decimals in two ways.

Method 1: Column addition and subtraction

Just like whole numbers, we can add and subtract decimals, we just need to remember to put in the decimal point.

What is the value of $2.64+4.38$

When adding using column addition, we do it in the exact same way, carrying 1 when the decimal value goes above 10.

$$2.64+4.38=7.02$$

What is the value of $9.23-2.35$

Remember, when we subtract a bigger number from a smaller number, we “borrow” 1 from the place value to the left.

$$9.23-2.35=6.88$$

KS3 Maths Revision Cards

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Example Questions

$$9.35-3.16=6.19$$

$$9.35-3.16=6.19$$

KS3 Maths Revision Cards

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