Keystones — Capstone
Five GCSE retrieval questions · 19 July 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √810
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: 2x² + 12x - 1
Answer: 2(x + 3)² - 19 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 12cm, angle = 74°. Give your answer to 2 decimal places
Answer: 109.58cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 15:10:12 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 30, 10, 51, 49, 41, 44, 52
Answer: Mean = 39.25, Median = 42.5, Range = 42