Keystones — Lintel
Five GCSE retrieval questions · 21 July 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 56,000,000 in standard form
Answer: 5.6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x - 10
Answer: (x + 10)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 40°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.85cm -
4. Ratio Mixed ratio problems
Divide 130 in the ratio 2:2:1
Answer: 52, 52 and 26 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 24, 37, 26, 21, what is the missing number?
Answer: 37