Keystones — Lintel
Five GCSE retrieval questions · 16 February 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.032 in standard form
Answer: 3.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 10x + 21
Answer: (x + 7)(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
Simplify the ratio 6m : 95cm
Answer: 120:19 -
5. Statistics Mean
The mean of 5 numbers is 23. If 4 of them are 23, 32, 26, 18, what is the missing number?
Answer: 16