Keystones — Capstone
Five GCSE retrieval questions · 7 January 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: 2x² + 24x - 11
Answer: 2(x + 6)² - 83 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 14cm, angle = 65°. Give your answer to 2 decimal places
Answer: 139.57cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 21:56:8 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 46, 57, 90, 83, 34, 39, 72
Answer: Mean = 64.75, Median = 64.5, Range = 63