Keystones — Lintel
Five GCSE retrieval questions · 19 April 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0029 in standard form
Answer: 2.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 32
Answer: (x + 8)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 15cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 2:1:3. What fraction of the sweets are purple?
Answer: 1⁄6 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 36, 18, 49, 27, what is the missing number?
Answer: 15