Keystones — Lintel
Five GCSE retrieval questions · 16 December 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 2,200,000 in standard form
Answer: 2.2 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 8
Answer: (x + 8)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 31°. Find opposite. Give your answer to 2 decimal places
Answer: 8.41cm -
4. Ratio Mixed ratio problems
Simplify the ratio m : 85cm
Answer: 20:17 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 19, 20, 27, 41, 50, what is the missing number?
Answer: 47