Keystones — Lintel
Five GCSE retrieval questions · 1 December 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 9,700,000 in standard form
Answer: 9.7 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 30
Answer: (x + 10)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 26°. Find adjacent side. Give your answer to 2 decimal places
Answer: 35.95cm -
4. Ratio Mixed ratio problems
Orange and purple counters are in the ratio 9:3. What fraction of the counters are orange?
Answer: 3⁄4 -
5. Statistics Mean
The mean of 4 numbers is 20. If 3 of them are 24, 22, 24, what is the missing number?
Answer: 10