Keystones — Lintel
Five GCSE retrieval questions · 2 September 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.064
Answer: 6.4 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 61°. Find adjacent side
Answer: 11.2cm -
4. Ratio Mixed ratio problems
£261.00 is shared between A and B in the ratio 4:5. How much does A receive?
Answer: £116.00 -
5. Statistics Mean
The mean of 6 numbers is 22. If 5 of them are 38, 27, 46, 44, 29, what is the missing number?
Answer: -52