Keystones — Capstone
Five GCSE retrieval questions · 18 November 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √275
Answer: 5√11 -
2. Algebra Completing the square
Complete the square: 2x² + 4x
Answer: 2(x + 1)² - 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 22cm, angle = 44°. Give your answer to 2 decimal places
Answer: 221.6cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 48:42:49 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 40, 82, 58, 16, 68, 35. Give your answer to 2 decimal places
Answer: Mean = 46.86, Median = 40, Range = 66