Keystones — Lintel
Five GCSE retrieval questions · 22 May 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.075 in standard form
Answer: 7.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 72
Answer: (x + 12)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 9.86cm -
4. Ratio Mixed ratio problems
Red and blue beads are in the ratio 13:2. What fraction of the beads are red?
Answer: 13⁄15 -
5. Statistics Mean
The mean of 6 numbers is 31. If 5 of them are 27, 47, 38, 27, 24, what is the missing number?
Answer: 23