Keystones — Capstone
Five GCSE retrieval questions · 29 November 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√176
Answer: 12√11 -
2. Algebra Completing the square
Complete the square: x² - 3x - 1
Answer: (x - 3⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 25cm, angle = 48°. Give your answer to 2 decimal places
Answer: 157.92cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 3:24:8 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 61, 34, 99, 36, 31, 69, 37, 15. Give your answer to 2 decimal places
Answer: Mean = 52.56, Median = 37, Range = 84