Keystones — Lintel
Five GCSE retrieval questions · 25 January 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0087 in standard form
Answer: 8.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x - 10
Answer: (x + 10)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 14.26cm -
4. Ratio Mixed ratio problems
Simplify: 12:8:8
Answer: 3:2:2 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 31, 28, 26, 44, 40, what is the missing number?
Answer: 29