Keystones — Lintel
Five GCSE retrieval questions · 1 October 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000051 in standard form
Answer: 5.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 28
Answer: (x + 4)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 14.41cm -
4. Ratio Mixed ratio problems
Orange and purple sweets are in the ratio 13:14. What fraction of the sweets are orange?
Answer: 13⁄27 -
5. Statistics Mean
The mean of 6 numbers is 35. If 5 of them are 24, 16, 33, 48, 50, what is the missing number?
Answer: 39