Keystones — Lintel
Five GCSE retrieval questions · 22 October 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0083
Answer: 8.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 12
Answer: (x - 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 43°. Find opposite
Answer: 14cm -
4. Ratio Mixed ratio problems
Divide 117 in the ratio 1:4:4
Answer: 13, 52 and 52 -
5. Statistics Mean
The mean of 5 numbers is 23. If 4 of them are 30, 41, 19, 15, what is the missing number?
Answer: 10