Keystones — Capstone
Five GCSE retrieval questions · 13 September 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √175
Answer: 5√7 -
2. Algebra Completing the square
Complete the square: x² + 5x + 6
Answer: (x + 5⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 17cm, angle = 56°. Give your answer to 2 decimal places
Answer: 112.75cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 16:18:27 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 17, 58, 65, 30, 75, 86. Give your answer to 2 decimal places
Answer: Mean = 49.14, Median = 58, Range = 73