KS3 Decimals & Rounding
KS3
Free lesson
Number
Decimals
Adding & Subtracting Decimals — KS3 Maths
A clear, step-by-step KS3 lesson on adding and subtracting decimals with the column method. Line up the decimal points, fill the gaps with zeros, then add or subtract and bring the point down.
Adding and subtracting decimals is just like whole numbers, as long as you line the decimal points up first. Write the numbers one above the other with their points lined up, fill any gaps with zeros, then add or subtract each column and bring the decimal point straight down. This lesson works through three column sums — two adding and one subtracting — with a guide line straight through the points so you can see exactly how they line up.
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A free printable worksheet with 16 questions and a full worked answer key. No sign-up needed.