Keystones — Lintel
Five GCSE retrieval questions · 17 September 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
96000000
Answer: 9.6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 24
Answer: (x - 6)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 61°. Find adjacent side
Answer: 7.3cm -
4. Ratio Mixed ratio problems
£423.00 is shared between A and B in the ratio 4:5. How much does A receive?
Answer: £188.00 -
5. Statistics Mean
The mean of 5 numbers is 25. If 4 of them are 41, 15, 45, 21, what is the missing number?
Answer: 3