Keystones — Lintel
Five GCSE retrieval questions · 22 September 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.085
Answer: 8.5 × 10^-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 25
Answer: (x - 5)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 46°. Find opposite
Answer: 14.5cm -
4. Ratio Mixed ratio problems
Divide 108 in the ratio 4:4:1
Answer: 48, 48 and 12 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 20, 34, 22, 29, what is the missing number?
Answer: 90