Keystones — Lintel
Five GCSE retrieval questions · 11 April 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0048
Answer: 4.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 30
Answer: (x - 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 37°. Find adjacent side
Answer: 24.8cm -
4. Ratio Mixed ratio problems
Divide 232 in the ratio 2:3:3
Answer: 58, 87 and 87 -
5. Statistics Mean
The mean of 6 numbers is 35. If 5 of them are 19, 42, 18, 37, 21, what is the missing number?
Answer: 73