Keystones — Capstone
Five GCSE retrieval questions · 13 June 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√90
Answer: 12√10 -
2. Algebra Completing the square
Complete the square: x² - 7x + 7
Answer: (x - 7⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 23cm, angle = 53°. Give your answer to 2 decimal places
Answer: 211.24cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 72:40:25 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 56, 68, 58, 55, 44, 81, 62, 38. Give your answer to 2 decimal places
Answer: Mean = 58.44, Median = 58, Range = 43