Keystones — Lintel
Five GCSE retrieval questions · 24 February 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00063
Answer: 6.3 × 10^-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 10
Answer: (x - 2)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 35°. Find adjacent side
Answer: 12.3cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2m:200cm
Answer: 1:100 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 21, 47, 37, 16, 31, what is the missing number?
Answer: 28