Keystones — Lintel
Five GCSE retrieval questions · 10 January 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00038
Answer: 3.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 12
Answer: (x + 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 39°. Find adjacent side
Answer: 22.5cm -
4. Ratio Mixed ratio problems
Divide 72 in the ratio 2:1:1
Answer: 36, 18 and 18 -
5. Statistics Mean
The mean of 5 numbers is 20. If 4 of them are 44, 42, 20, 47, what is the missing number?
Answer: -53