Keystones — Lintel
Five GCSE retrieval questions · 8 November 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 24,000 in standard form
Answer: 2.4 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 72
Answer: (x + 9)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 41°. Find adjacent side. Give your answer to 2 decimal places
Answer: 27.17cm -
4. Ratio Mixed ratio problems
Red and blue beads are in the ratio 4:8. What fraction of the beads are red?
Answer: 1⁄3 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 37, 32, 30, what is the missing number?
Answer: 61