Keystones — Lintel
Five GCSE retrieval questions · 1 February 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 50,000,000 in standard form
Answer: 5 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 6.25cm -
4. Ratio Mixed ratio problems
Orange and purple sweets are in the ratio 6:13. What fraction of the sweets are purple?
Answer: 13⁄19 -
5. Statistics Mean
The mean of 6 numbers is 40. If 5 of them are 50, 31, 24, 43, 26, what is the missing number?
Answer: 66