Keystones — Lintel
Five GCSE retrieval questions · 23 June 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000046 in standard form
Answer: 4.6 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 63
Answer: (x + 9)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 34.58cm -
4. Ratio Mixed ratio problems
Divide 105 in the ratio 2:1:2
Answer: 42, 21 and 42 -
5. Statistics Mean
The mean of 5 numbers is 27. If 4 of them are 39, 22, 26, 24, what is the missing number?
Answer: 24