Keystones — Lintel
Five GCSE retrieval questions · 7 October 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00097 in standard form
Answer: 9.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x + 15
Answer: (x + 5)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 55°. Find adjacent side. Give your answer to 2 decimal places
Answer: 10.9cm -
4. Ratio Mixed ratio problems
Black, white and yellow sweets are in the ratio 8:7:10. What fraction of the sweets are yellow?
Answer: 2⁄5 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 23, 31, 36, 30, what is the missing number?
Answer: 40