Keystones — Lintel
Five GCSE retrieval questions · 3 June 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 38,000,000 in standard form
Answer: 3.8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 33°. Find opposite. Give your answer to 2 decimal places
Answer: 16.24cm -
4. Ratio Mixed ratio problems
Red and blue beads are in the ratio 14:11. What fraction of the beads are blue?
Answer: 11⁄25 -
5. Statistics Mean
Calculate the mean of: 49, 25, 20, 17, 16, 47
Answer: 29