Keystones — Lintel
Five GCSE retrieval questions · 30 June 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00064
Answer: 6.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 4
Answer: (x + 4)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 30°. Find adjacent side
Answer: 14.7cm -
4. Ratio Mixed ratio problems
Express the first part of 3:5 as a fraction in simplest form
Answer: 3⁄8 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 30, 43, 29, what is the missing number?
Answer: 34