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subtract fractions
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The pattern behind it: P5 fraction foundations
Translate division into a fraction, then calculate exactly with mixed and improper fractions.
In this one. Use equal-sized parts before subtracting. The denominator stays fixed while the numerators are compared.
How to spot it
Two fractions with different denominators to add or compare, or a mixed number to calculate with, point here.
Common mistake
Children add or compare the numerators straight away without rewriting the denominators to match first, treating a third plus a sixth as two sevenths.
Try one like it
Standard add fractions Calculate 3/5 + 1/2.The 33 problem patterns
All 33 patterns, one to a page — the 19 behind Primary 5 and 6 word problems, and the skills the younger years are built on. The bar model, how to spot it in the question, and the mistake children make. A booklet you can print. Free.
A PDF, and a note when new solutions go up.