Keystones — Lintel
Five GCSE retrieval questions · 29 September 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.005
Answer: 5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 35
Answer: (x - 5)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 50°. Find opposite
Answer: 14.3cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4m:400cm
Answer: 1:100 -
5. Statistics Mean
The mean of 6 numbers is 40. If 5 of them are 31, 45, 36, 22, 21, what is the missing number?
Answer: 85