Keystones — Capstone
Five GCSE retrieval questions · 4 September 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √792
Answer: 6√22 -
2. Algebra Completing the square
Complete the square: x² + 11x - 10
Answer: (x + 11⁄2)² - 161⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 24cm, angle = 77°. Give your answer to 2 decimal places
Answer: 350.77cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 40:45:36 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 53, 67, 81, 42, 90, 20, 14
Answer: Mean = 54, Median = 59, Range = 76