Keystones — Capstone
Five GCSE retrieval questions · 17 August 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √735
Answer: 7√15 -
2. Algebra Completing the square
Complete the square: x² + 9x + 11
Answer: (x + 9⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 16cm, angle = 67°. Give your answer to 2 decimal places
Answer: 162.01cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 21:24:20 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 49, 45, 86, 99, 49, 67. Give your answer to 2 decimal places
Answer: Mean = 60.57, Median = 49, Range = 70