Keystones — Lintel
Five GCSE retrieval questions · 8 July 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0094 in standard form
Answer: 9.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 44
Answer: (x + 11)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 60°. Find adjacent side
Answer: 8.5cm -
4. Ratio Mixed ratio problems
Divide 176 in the ratio 2:3:3
Answer: 44, 66 and 66 -
5. Statistics Mean
The mean of 5 numbers is 23. If 4 of them are 18, 16, 21, 29, what is the missing number?
Answer: 31