Keystones — Capstone
Five GCSE retrieval questions · 8 August 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√45
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: x² - 7x - 3
Answer: (x - 7⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 14cm, angle = 57°. Give your answer to 2 decimal places
Answer: 88.06cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 15:40:64 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 60, 95, 41, 84, 11, 73, 41
Answer: Mean = 60.75, Median = 66.5, Range = 84