Keystones — Lintel
Five GCSE retrieval questions · 14 December 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000089 in standard form
Answer: 8.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 38°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.28cm -
4. Ratio Mixed ratio problems
Divide 136 in the ratio 4:3:1
Answer: 68, 51 and 17 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 24, 44, 32, what is the missing number?
Answer: 56