Keystones — Capstone
Five GCSE retrieval questions · 7 June 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √686
Answer: 7√14 -
2. Algebra Completing the square
Complete the square: 5x² - 40x - 9
Answer: 5(x - 4)² - 89 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 25cm, angle = 61°. Give your answer to 2 decimal places
Answer: 240.52cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 5:10:6 -
5. Statistics Averages and range
Find the mean, median and range of: 32, 42, 25, 55, 85, 41, 33, 16, 63. Give your answer to 2 decimal places
Answer: Mean = 43.56, Median = 41, Range = 69