Keystones — Lintel
Five GCSE retrieval questions · 24 February 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000025 in standard form
Answer: 2.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 12x + 20
Answer: (x + 10)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 37°. Find adjacent side. Give your answer to 2 decimal places
Answer: 31.15cm -
4. Ratio Mixed ratio problems
Orange and purple sweets are in the ratio 6:12. What fraction of the sweets are purple?
Answer: 2⁄3 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 26, 46, 21, 21, what is the missing number?
Answer: 56