Keystones — Lintel
Five GCSE retrieval questions · 20 October 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 84,000 in standard form
Answer: 8.4 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 18
Answer: (x + 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 56°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.18cm -
4. Ratio Mixed ratio problems
Divide 128 in the ratio 1:4:3
Answer: 16, 64 and 48 -
5. Statistics Mean
The mean of 6 numbers is 25. If 5 of them are 22, 32, 38, 26, 23, what is the missing number?
Answer: 9