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Help at home · Maths

How to explain fractions, decimals and percentages to your child

A big 11+ topic: fractions and percentages of amounts, calculating with fractions and decimals, converting between them and putting them in order.

The note

How schools teach it now

Schools picture fractions with bar models and number lines and link the three forms: 1/4 = 0.25 = 25%. Children learn the key equivalents by heart (halves, quarters, fifths, tenths) and simplify by dividing the top and bottom by the same number.

5-minute kitchen-table activity

Cut a pizza or cake into 8 slices. What fraction is one slice? As a decimal? As a percentage? If three slices are eaten, what fraction is left? (5/8.)

Worked example

Put these in order, smallest first: 0.6, 3/4, 55%, 2/3

  1. Turn them all into percentages.
  2. 0.6 = 60% and 3/4 = 75%.
  3. 2/3 = 2 ÷ 3 = 0.666…, about 66.7%.

Answer: 55%, 0.6, 2/3, 3/4

Common mistakes to watch for

  • Thinking a bigger denominator means a bigger fraction (1/8 is smaller than 1/4).
  • Writing 0.3 as 3% (it's 30%).
  • Comparing a fraction and a decimal without converting first.

Encouragement

Try saying
“Let's turn them all into the same kind, then compare.”
Rather than
“Fractions were always my worst subject too.”

Practise fractions, decimals and percentages with marked questions

Academy11+ marks every answer, shows how your child is doing in each topic and puts the right home-help note next to the ones they find hard.