Keystones — Lintel
Five GCSE retrieval questions · 1 December 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00066 in standard form
Answer: 6.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 54
Answer: (x + 9)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 51°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.03cm -
4. Ratio Mixed ratio problems
Divide 90 in the ratio 3:1:1
Answer: 54, 18 and 18 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 33, 32, 43, 23, 26, what is the missing number?
Answer: 59