Keystones — Lintel
Five GCSE retrieval questions · 20 June 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.089
Answer: 8.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 24
Answer: (x + 8)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 56°. Find opposite
Answer: 37.cm -
4. Ratio Mixed ratio problems
Divide 70 in the ratio 1:2:4
Answer: 10, 20 and 40 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 33, 38, 42, 20, 30, what is the missing number?
Answer: 29