Keystones — Lintel
Five GCSE retrieval questions · 4 September 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.013
Answer: 1.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 4
Answer: (x + 4)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 50°. Find adjacent side
Answer: 21.2cm -
4. Ratio Mixed ratio problems
£203.00 is shared between A and B in the ratio 5:2. How much does A receive?
Answer: £145.00 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 20, 30, 21, 30, what is the missing number?
Answer: 99