Keystones — Capstone
Five GCSE retrieval questions · 17 November 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√250
Answer: 25√10 -
2. Algebra Completing the square
Complete the square: x² - 11x + 10
Answer: (x - 11⁄2)² - 81⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 15cm, angle = 63°. Give your answer to 2 decimal places
Answer: 147.02cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 81:72:40 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 93, 51, 73, 52, 28, 16, 18, 89. Give your answer to 2 decimal places
Answer: Mean = 48.22, Median = 51, Range = 79