Keystones — Lintel
Five GCSE retrieval questions · 17 June 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 130,000 in standard form
Answer: 1.3 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x - 22
Answer: (x + 2)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 50°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.28cm -
4. Ratio Mixed ratio problems
Black and white beads are in the ratio 7:2. What fraction of the beads are white?
Answer: 2⁄9 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 20, 22, 43, what is the missing number?
Answer: 35