Keystones — Lintel
Five GCSE retrieval questions · 2 September 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000055 in standard form
Answer: 5.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 24
Answer: (x + 3)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 34°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.58cm -
4. Ratio Mixed ratio problems
Divide 90 in the ratio 3:4:2
Answer: 30, 40 and 20 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 37, 32, 24, 34, what is the missing number?
Answer: 23