Keystones — Lintel
Five GCSE retrieval questions · 20 August 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 950,000 in standard form
Answer: 9.5 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 19x + 90
Answer: (x + 10)(x + 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 30°. Find adjacent side. Give your answer to 2 decimal places
Answer: 33.77cm -
4. Ratio Mixed ratio problems
Red, blue and green beads are in the ratio 4:4:9. What fraction of the beads are red?
Answer: 4⁄17 -
5. Statistics Mean
The mean of 6 numbers is 27. If 5 of them are 15, 33, 49, 16, 21, what is the missing number?
Answer: 28