Keystones — Lintel
Five GCSE retrieval questions · 28 February 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0086
Answer: 8.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 30
Answer: (x - 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 51°. Find adjacent side
Answer: 11.3cm -
4. Ratio Mixed ratio problems
Divide 200 in the ratio 1:2:2
Answer: 40, 80 and 80 -
5. Statistics Mean
The mean of 6 numbers is 26. If 5 of them are 15, 26, 49, 23, 43, what is the missing number?
Answer: 0