Keystones — Lintel
Five GCSE retrieval questions · 31 May 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 80,000,000 in standard form
Answer: 8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 40°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.22cm -
4. Ratio Mixed ratio problems
Black and white beads are in the ratio 15:8. What fraction of the beads are black?
Answer: 15⁄23 -
5. Statistics Mean
Calculate the mean of: 48, 6, 25, 16, 30, 35, 37, 6. Give your answer to 2 decimal places
Answer: 25.38