Keystones — Lintel
Five GCSE retrieval questions · 17 April 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000091 in standard form
Answer: 9.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 20
Answer: (x + 2)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 28.6cm -
4. Ratio Mixed ratio problems
Divide 66 in the ratio 2:1:3
Answer: 22, 11 and 33 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 40, 49, 31, what is the missing number?
Answer: 20