Keystones — Lintel
Five GCSE retrieval questions · 21 August 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0034 in standard form
Answer: 3.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 50
Answer: (x + 10)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 64°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.78cm -
4. Ratio Mixed ratio problems
Divide 150 in the ratio 4:3:3
Answer: 60, 45 and 45 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 40, 43, 35, 42, 29, what is the missing number?
Answer: 15