Keystones — Capstone
Five GCSE retrieval questions · 20 June 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² - 3x + 1
Answer: (x - 3⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 14cm, angle = 45°. Give your answer to 2 decimal places
Answer: 128.69cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 10:45:63 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 88, 77, 16, 87, 10, 14, 25, 35. Give your answer to 2 decimal places
Answer: Mean = 44.78, Median = 35, Range = 78