Keystones — Lintel
Five GCSE retrieval questions · 15 November 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 8,000,000 in standard form
Answer: 8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x + 20
Answer: (x + 5)(x + 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 57°. Find opposite. Give your answer to 2 decimal places
Answer: 30.8cm -
4. Ratio Mixed ratio problems
Divide 126 in the ratio 1:1:4
Answer: 21, 21 and 84 -
5. Statistics Mean
The mean of 4 numbers is 29. If 3 of them are 18, 33, 45, what is the missing number?
Answer: 20