Keystones — Capstone
Five GCSE retrieval questions · 17 September 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √150
Answer: 5√6 -
2. Algebra Completing the square
Complete the square: x² - 11x + 4
Answer: (x - 11⁄2)² - 105⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 22cm, angle = 45°. Give your answer to 2 decimal places
Answer: 194.45cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 6:10:5 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 31, 96, 61, 98, 93, 50, 70, 63. Give your answer to 2 decimal places
Answer: Mean = 72.67, Median = 70, Range = 67