Keystones — Lintel
Five GCSE retrieval questions · 8 November 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000017 in standard form
Answer: 1.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x + 3
Answer: (x + 3)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 26°. Find adjacent side. Give your answer to 2 decimal places
Answer: 31.46cm -
4. Ratio Mixed ratio problems
Black and white beads are in the ratio 14:2. What fraction of the beads are black?
Answer: 7⁄8 -
5. Statistics Mean
The mean of 5 numbers is 23. If 4 of them are 16, 23, 27, 24, what is the missing number?
Answer: 25