Keystones — Lintel
Five GCSE retrieval questions · 28 October 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00032
Answer: 3.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 37°. Find adjacent side
Answer: 15.2cm -
4. Ratio Mixed ratio problems
Divide 189 in the ratio 3:2:2
Answer: 81, 54 and 54 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 45, 25, 29, 29, what is the missing number?
Answer: 67