Keystones — Capstone
Five GCSE retrieval questions · 27 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √605
Answer: 11√5 -
2. Algebra Completing the square
Complete the square: x² + 7x + 2
Answer: (x + 7⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 13cm, angle = 69°. Give your answer to 2 decimal places
Answer: 72.82cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 49:63:72 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 42, 34, 67, 100, 50, 69, 68
Answer: Mean = 57.5, Median = 58.5, Range = 70