Keystones — Lintel
Five GCSE retrieval questions · 3 October 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0077 in standard form
Answer: 7.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 50
Answer: (x + 5)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 51°. Find adjacent side. Give your answer to 2 decimal places
Answer: 24.54cm -
4. Ratio Mixed ratio problems
In ratio 7:9:10, what fraction is the second part?
Answer: 9⁄26 -
5. Statistics Mean
The mean of 6 numbers is 40. If 5 of them are 38, 44, 46, 21, 23, what is the missing number?
Answer: 68