Keystones — Capstone
Five GCSE retrieval questions · 14 December 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √847
Answer: 11√7 -
2. Algebra Completing the square
Complete the square: x² - 3x + 6
Answer: (x - 3⁄2)² + 15⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 27cm, angle = 76°. Give your answer to 2 decimal places
Answer: 170.29cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 18:30:35 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 83, 54, 48, 76, 15, 29, 48
Answer: Mean = 56.25, Median = 51, Range = 82