Keystones — Capstone
Five GCSE retrieval questions · 31 March 2013 · 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 + 8
Answer: (x + 9⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 24cm, angle = 71°. Give your answer to 2 decimal places
Answer: 158.85cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 10:12:15 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 26, 29, 45, 40, 47, 32
Answer: Mean = 37, Median = 40, Range = 21