Keystones — Lintel
Five GCSE retrieval questions · 17 May 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0079 in standard form
Answer: 7.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 14
Answer: (x + 7)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 45°. Find opposite
Answer: 22cm -
4. Ratio Mixed ratio problems
Orange, purple and pink beads are in the ratio 12:3:5. What fraction of the beads are orange?
Answer: 3⁄5 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 36, 48, 25, what is the missing number?
Answer: 11