Keystones — Lintel
Five GCSE retrieval questions · 24 June 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 33,000,000 in standard form
Answer: 3.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 30
Answer: (x + 3)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 52°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.78cm -
4. Ratio Mixed ratio problems
Divide 175 in the ratio 2:3:2
Answer: 50, 75 and 50 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 42, 34, 38, 23, what is the missing number?
Answer: 63