Keystones — Lintel
Five GCSE retrieval questions · 7 March 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0082 in standard form
Answer: 8.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 6
Answer: (x + 1)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 35°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.66cm -
4. Ratio Mixed ratio problems
Divide 160 in the ratio 1:1:2
Answer: 40, 40 and 80 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 26, 41, 40, what is the missing number?
Answer: 21