Keystones — Lintel
Five GCSE retrieval questions · 28 February 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 740,000 in standard form
Answer: 7.4 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 15
Answer: (x + 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 56°. Find opposite. Give your answer to 2 decimal places
Answer: 41.51cm -
4. Ratio Mixed ratio problems
Red and blue beads are in the ratio 4:5. What fraction of the beads are red?
Answer: 4⁄9 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 35, 30, 43, 27, 29, what is the missing number?
Answer: 28