Keystones — Lintel
Five GCSE retrieval questions · 13 December 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.076 in standard form
Answer: 7.6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 46.41cm -
4. Ratio Mixed ratio problems
Divide 60 in the ratio 1:2:1
Answer: 15, 30 and 15 -
5. Statistics Mean
The mean of 6 numbers is 37. If 5 of them are 41, 21, 32, 22, 49, what is the missing number?
Answer: 57