Keystones — Lintel
Five GCSE retrieval questions · 25 July 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0024
Answer: 2.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 53°. Find opposite
Answer: 22.6cm -
4. Ratio Mixed ratio problems
Divide 253 in the ratio 3:4:4
Answer: 69, 92 and 92 -
5. Statistics Mean
The mean of 5 numbers is 22. If 4 of them are 25, 23, 21, 25, what is the missing number?
Answer: 16