Keystones — Capstone
Five GCSE retrieval questions · 28 November 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √960
Answer: 8√15 -
2. Algebra Completing the square
Complete the square: x² - 11x + 7
Answer: (x - 11⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 21cm, angle = 48°. Give your answer to 2 decimal places
Answer: 140.45cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 35:42:30 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 89, 100, 87, 58, 43, 41. Give your answer to 2 decimal places
Answer: Mean = 67.71, Median = 58, Range = 59