Keystones — Lintel
Five GCSE retrieval questions · 2 December 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 580,000,000 in standard form
Answer: 5.8 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 43°. Find opposite. Give your answer to 2 decimal places
Answer: 10.26cm -
4. Ratio Mixed ratio problems
Divide 220 in the ratio 3:4:3
Answer: 66, 88 and 66 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 40, 18, 41, 23, what is the missing number?
Answer: 63