Keystones — Capstone
Five GCSE retrieval questions · 15 March 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √72
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: 5x² - 60x + 15
Answer: 5(x - 6)² - 165 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 16cm, angle = 53°. Give your answer to 2 decimal places
Answer: 102.23cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 25:40:24 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 48, 84, 25, 52, 65, 69. Give your answer to 2 decimal places
Answer: Mean = 55.57, Median = 52, Range = 59