Keystones — Capstone
Five GCSE retrieval questions · 6 June 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: x² + 3x + 4
Answer: (x + 3⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 30cm, angle = 73°. Give your answer to 2 decimal places
Answer: 315.58cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 10:15:3 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 71, 50, 34, 31, 92, 10, 33. Give your answer to 2 decimal places
Answer: Mean = 46.63, Median = 42, Range = 82