Keystones — Lintel
Five GCSE retrieval questions · 15 March 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 72,000 in standard form
Answer: 7.2 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 40
Answer: (x + 5)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 38°. Find adjacent side. Give your answer to 2 decimal places
Answer: 24.43cm -
4. Ratio Mixed ratio problems
Divide 147 in the ratio 2:4:1
Answer: 42, 84 and 21 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 49, 32, 41, 20, 47, what is the missing number?
Answer: 27