Keystones — Lintel
Five GCSE retrieval questions · 12 February 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.049 in standard form
Answer: 4.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 15x + 36
Answer: (x + 12)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 55°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.77cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4 hours : 25 minutes
Answer: 48:5 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 36, 25, 45, what is the missing number?
Answer: 46