Keystones — Lintel
Five GCSE retrieval questions · 21 February 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0086 in standard form
Answer: 8.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 27.21cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3m : 90cm
Answer: 10:3 -
5. Statistics Mean
The mean of 6 numbers is 26. If 5 of them are 17, 50, 23, 30, 22, what is the missing number?
Answer: 14