Keystones — Capstone
Five GCSE retrieval questions · 25 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√20
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: x² - 11x - 7
Answer: (x - 11⁄2)² - 149⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 22cm, angle = 51°. Give your answer to 2 decimal places
Answer: 128.23cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 63:56:24 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 54, 23, 76, 21, 73, 83. Give your answer to 2 decimal places
Answer: Mean = 60.57, Median = 73, Range = 73