Keystones — Lintel
Five GCSE retrieval questions · 21 August 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0062 in standard form
Answer: 6.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 15x + 56
Answer: (x - 7)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 7.04cm -
4. Ratio Mixed ratio problems
Divide 171 in the ratio 3:2:4
Answer: 57, 38 and 76 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 27, 48, 21, what is the missing number?
Answer: 32