Keystones — Lintel
Five GCSE retrieval questions · 8 February 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
19000000
Answer: 1.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 26°. Find adjacent side
Answer: 34.2cm -
4. Ratio Mixed ratio problems
Divide 117 in the ratio 4:4:1
Answer: 52, 52 and 13 -
5. Statistics Mean
The mean of 4 numbers is 24. If 3 of them are 39, 18, 42, what is the missing number?
Answer: -3