Keystones — Lintel
Five GCSE retrieval questions · 15 December 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000056 in standard form
Answer: 5.6 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 19x + 84
Answer: (x + 12)(x + 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 60°. Find adjacent side
Answer: 12cm -
4. Ratio Mixed ratio problems
Simplify the ratio 1 hour : 30 minutes
Answer: 2:1 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 26, 50, 24, what is the missing number?
Answer: 48