Keystones — Lintel
Five GCSE retrieval questions · 2 April 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 4,100,000 in standard form
Answer: 4.1 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 8
Answer: (x + 2)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 43°. Find opposite. Give your answer to 2 decimal places
Answer: 22.38cm -
4. Ratio Mixed ratio problems
Divide 161 in the ratio 1:2:4
Answer: 23, 46 and 92 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 49, 38, 19, 24, what is the missing number?
Answer: 10