Keystones — Lintel
Five GCSE retrieval questions · 12 June 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0009
Answer: 9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 38°. Find adjacent side
Answer: 15cm -
4. Ratio Mixed ratio problems
Express the first part of 3:2 as a fraction in simplest form
Answer: 3⁄5 -
5. Statistics Mean
The mean of 6 numbers is 28. If 5 of them are 25, 49, 16, 15, 34, what is the missing number?
Answer: 29