Keystones — Lintel
Five GCSE retrieval questions · 30 November 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 83,000,000 in standard form
Answer: 8.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 42
Answer: (x + 6)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 56°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.18cm -
4. Ratio Mixed ratio problems
Divide 152 in the ratio 1:1:2
Answer: 38, 38 and 76 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 33, 36, 18, what is the missing number?
Answer: 41