Keystones — Lintel
Five GCSE retrieval questions · 9 October 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
210000
Answer: 2.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 36°. Find adjacent side
Answer: 17cm -
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 39. If 4 of them are 16, 27, 45, 38, what is the missing number?
Answer: 69