Keystones — Lintel
Five GCSE retrieval questions · 5 October 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.039
Answer: 3.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 15
Answer: (x - 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 55°. Find adjacent side
Answer: 19.5cm -
4. Ratio Mixed ratio problems
Divide 80 in the ratio 1:2:2
Answer: 16, 32 and 32 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 44, 16, 37, what is the missing number?
Answer: 27