Keystones — Lintel
Five GCSE retrieval questions · 9 March 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
48000
Answer: 4.8 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 24
Answer: (x - 6)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 34°. Find adjacent side
Answer: 23.2cm -
4. Ratio Mixed ratio problems
Divide 108 in the ratio 1:2:3
Answer: 18, 36 and 54 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 31, 45, 21, 44, what is the missing number?
Answer: 59