Keystones — Lintel
Five GCSE retrieval questions · 20 July 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00037 in standard form
Answer: 3.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 22x + 120
Answer: (x - 10)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 50°. Find adjacent side. Give your answer to 2 decimal places
Answer: 25.71cm -
4. Ratio Mixed ratio problems
In ratio 5:8:4, what fraction is the third part?
Answer: 4⁄17 -
5. Statistics Mean
The mean of 4 numbers is 23. If 3 of them are 35, 23, 27, what is the missing number?
Answer: 7