Keystones — Lintel
Five GCSE retrieval questions · 30 May 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000074 in standard form
Answer: 7.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 12
Answer: (x - 1)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 21.45cm -
4. Ratio Mixed ratio problems
Divide 115 in the ratio 2:1:2
Answer: 46, 23 and 46 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 28, 32, 45, 24, what is the missing number?
Answer: 46