Keystones — Capstone
Five GCSE retrieval questions · 8 November 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√112
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: 4x² - 32x + 1
Answer: 4(x - 4)² - 63 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 24cm, angle = 50°. Give your answer to 2 decimal places
Answer: 137.89cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 8:72:27 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 68, 22, 68, 40, 44, 26, 14
Answer: Mean = 45, Median = 42, Range = 64