Keystones — Capstone
Five GCSE retrieval questions · 5 August 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² + 11x - 11
Answer: (x + 11⁄2)² - 165⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 20cm, angle = 59°. Give your answer to 2 decimal places
Answer: 120cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 28:24:15 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 47, 80, 88, 80, 70, 74, 59. Give your answer to 2 decimal places
Answer: Mean = 68.63, Median = 72, Range = 41