Keystones — Capstone
Five GCSE retrieval questions · 14 December 2012 · 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 - 7x + 7
Answer: (x - 7⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 17cm, angle = 73°. Give your answer to 2 decimal places
Answer: 105.67cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 81:36:8 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 91, 47, 50, 99, 20, 15
Answer: Mean = 49, Median = 47, Range = 84