Keystones — Lintel
Five GCSE retrieval questions · 19 November 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0052 in standard form
Answer: 5.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x + 4
Answer: (x + 4)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 50°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.14cm -
4. Ratio Mixed ratio problems
Divide 91 in the ratio 1:3:3
Answer: 13, 39 and 39 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 42, 25, 45, 18, what is the missing number?
Answer: 40