Keystones — Lintel
Five GCSE retrieval questions · 10 December 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 40,000,000 in standard form
Answer: 4 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 8
Answer: (x + 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 38°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.18cm -
4. Ratio Mixed ratio problems
Divide 128 in the ratio 3:1:4
Answer: 48, 16 and 64 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 31, 46, 24, 25, what is the missing number?
Answer: 39