Keystones — Capstone
Five GCSE retrieval questions · 6 March 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: 5x² - 50x + 9
Answer: 5(x - 5)² - 116 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 17cm, angle = 50°. Give your answer to 2 decimal places
Answer: 188.83cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 24:56:21 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 69, 10, 36, 66, 90, 64, 30, 71
Answer: Mean = 56, Median = 66, Range = 80