Keystones — Lintel
Five GCSE retrieval questions · 27 January 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00098
Answer: 9.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 46°. Find adjacent side
Answer: 25.7cm -
4. Ratio Mixed ratio problems
Divide 144 in the ratio 3:2:1
Answer: 72, 48 and 24 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 27, 26, 19, 50, 18, what is the missing number?
Answer: 94