Keystones — Lintel
Five GCSE retrieval questions · 19 December 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000083 in standard form
Answer: 8.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x - 10
Answer: (x + 10)(x - 1) -
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
Simplify the ratio 3 litres : 400 ml
Answer: 15:2 -
5. Statistics Mean
The mean of 6 numbers is 38. If 5 of them are 44, 17, 41, 39, 21, what is the missing number?
Answer: 66