Keystones — Lintel
Five GCSE retrieval questions · 21 June 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 60,000,000 in standard form
Answer: 6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 90
Answer: (x + 10)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 52°. Find adjacent side. Give your answer to 2 decimal places
Answer: 24.63cm -
4. Ratio Mixed ratio problems
Black, white and yellow beads are in the ratio 6:3:9. What fraction of the beads are black?
Answer: 1⁄3 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 16, 17, 23, 43, what is the missing number?
Answer: 61