Keystones — Lintel
Five GCSE retrieval questions · 13 March 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
42000
Answer: 4.2 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 15
Answer: (x - 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 59°. Find adjacent side
Answer: 10.3cm -
4. Ratio Mixed ratio problems
Divide 108 in the ratio 1:1:4
Answer: 18, 18 and 72 -
5. Statistics Mean
The mean of 4 numbers is 27. If 3 of them are 49, 44, 42, what is the missing number?
Answer: -27