Keystones — Lintel
Five GCSE retrieval questions · 19 March 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0048 in standard form
Answer: 4.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 37°. Find adjacent side. Give your answer to 2 decimal places
Answer: 31.95cm -
4. Ratio Mixed ratio problems
Red and blue beads are in the ratio 7:11. What fraction of the beads are blue?
Answer: 11⁄18 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 43, 47, 37, what is the missing number?
Answer: 21