Keystones — Lintel
Five GCSE retrieval questions · 15 April 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000091 in standard form
Answer: 9.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 60
Answer: (x + 12)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 48°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.4cm -
4. Ratio Mixed ratio problems
Black, white and yellow beads are in the ratio 8:4:10. What fraction of the beads are yellow?
Answer: 5⁄11 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 33, 30, 35, 46, 15, what is the missing number?
Answer: 33