Keystones — Lintel
Five GCSE retrieval questions · 19 March 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 99,000,000 in standard form
Answer: 9.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 20
Answer: (x + 10)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 45°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.85cm -
4. Ratio Mixed ratio problems
Red and blue beads are in the ratio 4:3. What fraction of the beads are red?
Answer: 4⁄7 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 41, 26, 39, what is the missing number?
Answer: 30