Keystones — Capstone
Five GCSE retrieval questions · 7 March 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √180
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: 5x² + 50x + 12
Answer: 5(x + 5)² - 113 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 23cm, angle = 49°. Give your answer to 2 decimal places
Answer: 164.9cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 24:21:35 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 41, 29, 20, 67, 83, 98. Give your answer to 2 decimal places
Answer: Mean = 59.14, Median = 67, Range = 78