Keystones — Lintel
Five GCSE retrieval questions · 11 April 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
7700000
Answer: 7.7 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x + 8
Answer: (x - 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 31°. Find adjacent side
Answer: 15.4cm -
4. Ratio Mixed ratio problems
Divide 154 in the ratio 3:4:4
Answer: 42, 56 and 56 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 38, 40, 15, 42, 18, what is the missing number?
Answer: 21