Keystones — Capstone
Five GCSE retrieval questions · 15 February 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √1000
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: x² + 11x - 10
Answer: (x + 11⁄2)² - 161⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 27cm, angle = 72°. Give your answer to 2 decimal places
Answer: 295.3cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 14:10:5 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 57, 39, 86, 62, 78, 46. Give your answer to 2 decimal places
Answer: Mean = 65.57, Median = 62, Range = 52