Keystones — Capstone
Five GCSE retrieval questions · 13 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √180
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: x² - 7x + 7
Answer: (x - 7⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 24cm, angle = 49°. Give your answer to 2 decimal places
Answer: 126.79cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 7:28:24 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 93, 52, 37, 86, 42, 40, 68. Give your answer to 2 decimal places
Answer: Mean = 64.63, Median = 60, Range = 62