Keystones — Capstone
Five GCSE retrieval questions · 4 October 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √486
Answer: 9√6 -
2. Algebra Completing the square
Complete the square: x² + x
Answer: (x + 1⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 23cm, angle = 47°. Give your answer to 2 decimal places
Answer: 100.93cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 16:72:63 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 84, 41, 77, 10, 50, 44. Give your answer to 2 decimal places
Answer: Mean = 48.43, Median = 44, Range = 74