Keystones — Lintel
Five GCSE retrieval questions · 16 November 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 65,000,000 in standard form
Answer: 6.5 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x + 6
Answer: (x - 2)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 49°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.43cm -
4. Ratio Mixed ratio problems
Divide 98 in the ratio 2:1:4
Answer: 28, 14 and 56 -
5. Statistics Mean
The mean of 5 numbers is 21. If 4 of them are 31, 19, 24, 25, what is the missing number?
Answer: 6