Keystones — Lintel
Five GCSE retrieval questions · 13 January 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000018 in standard form
Answer: 1.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 70
Answer: (x + 10)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 34°. Find adjacent side. Give your answer to 2 decimal places
Answer: 33.16cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4m : 50cm
Answer: 8:1 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 45, 17, 26, what is the missing number?
Answer: 32