Keystones — Lintel
Five GCSE retrieval questions · 17 September 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0047 in standard form
Answer: 4.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 70
Answer: (x + 10)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 28°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.13cm -
4. Ratio Mixed ratio problems
Express the first part of 7:9 as a fraction in simplest form
Answer: 7⁄16 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 35, 46, 20, 47, what is the missing number?
Answer: 17