Keystones — Capstone
Five GCSE retrieval questions · 4 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √325
Answer: 5√13 -
2. Algebra Completing the square
Complete the square: x² + 7x - 6
Answer: (x + 7⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 20cm, angle = 67°. Give your answer to 2 decimal places
Answer: 248.54cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 14:35:10 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 85, 70, 100, 95, 60, 41. Give your answer to 2 decimal places
Answer: Mean = 65.86, Median = 70, Range = 90