Keystones — Lintel
Five GCSE retrieval questions · 31 October 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.077 in standard form
Answer: 7.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 48
Answer: (x + 8)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 50°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.5cm -
4. Ratio Mixed ratio problems
Divide 216 in the ratio 2:3:3
Answer: 54, 81 and 81 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 24, 26, 48, 22, what is the missing number?
Answer: 55