Keystones — Capstone
Five GCSE retrieval questions · 3 November 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √32
Answer: 4√2 -
2. Algebra Completing the square
Complete the square: x² - 11x - 4
Answer: (x - 11⁄2)² - 137⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 20cm, angle = 50°. Give your answer to 2 decimal places
Answer: 206.83cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 45:40:8 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 85, 74, 19, 94, 16, 24, 26, 26
Answer: Mean = 42, Median = 26, Range = 80