Keystones — Lintel
Five GCSE retrieval questions · 30 October 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.096
Answer: 9.6 × 10^-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x + 8
Answer: (x - 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 63°. Find adjacent side
Answer: 9.cm -
4. Ratio Mixed ratio problems
Divide 208 in the ratio 2:1:1
Answer: 104, 52 and 52 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 49, 21, 27, 49, what is the missing number?
Answer: 44