Keystones — Lintel
Five GCSE retrieval questions · 15 December 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.053
Answer: 5.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 35
Answer: (x - 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 58°. Find adjacent side
Answer: 7.9cm -
4. Ratio Mixed ratio problems
Divide 264 in the ratio 4:3:4
Answer: 96, 72 and 96 -
5. Statistics Mean
The mean of 6 numbers is 24. If 5 of them are 20, 23, 37, 23, 47, what is the missing number?
Answer: -6