Keystones — Lintel
Five GCSE retrieval questions · 28 February 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0092 in standard form
Answer: 9.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 19x + 90
Answer: (x - 9)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 48°. Find opposite. Give your answer to 2 decimal places
Answer: 24.43cm -
4. Ratio Mixed ratio problems
Divide 200 in the ratio 4:3:1
Answer: 100, 75 and 25 -
5. Statistics Mean
The mean of 4 numbers is 24. If 3 of them are 27, 22, 21, what is the missing number?
Answer: 26