Keystones — Lintel
Five GCSE retrieval questions · 12 April 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.05
Answer: 5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 25
Answer: (x - 5)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 45°. Find opposite
Answer: 16cm -
4. Ratio Mixed ratio problems
Divide 150 in the ratio 2:1:2
Answer: 60, 30 and 60 -
5. Statistics Mean
The mean of 6 numbers is 40. If 5 of them are 21, 18, 27, 17, 37, what is the missing number?
Answer: 120