Keystones — Lintel
Five GCSE retrieval questions · 30 December 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00074 in standard form
Answer: 7.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 15x + 50
Answer: (x + 10)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 45°. Find opposite
Answer: 17cm -
4. Ratio Mixed ratio problems
Red, blue and green sweets are in the ratio 10:5:11. What fraction of the sweets are green?
Answer: 11⁄26 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 42, 50, 33, 28, what is the missing number?
Answer: 32