Keystones — Lintel
Five GCSE retrieval questions · 23 April 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 710,000 in standard form
Answer: 7.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 40
Answer: (x + 8)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 61°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.03cm -
4. Ratio Mixed ratio problems
Divide 308 in the ratio 3:4:4
Answer: 84, 112 and 112 -
5. Statistics Mean
The mean of 4 numbers is 22. If 3 of them are 23, 21, 31, what is the missing number?
Answer: 13