Keystones — Capstone
Five GCSE retrieval questions · 22 March 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: 4x² - 16x + 15
Answer: 4(x - 2)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 15cm, angle = 45°. Give your answer to 2 decimal places
Answer: 121.98cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 7:28:16 -
5. Statistics Averages and range
Find the mean, median and range of: 44, 87, 51, 89, 98, 79, 19, 69
Answer: Mean = 67, Median = 74, Range = 79