Keystones — Capstone
Five GCSE retrieval questions · 7 September 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√80
Answer: 20√5 -
2. Algebra Completing the square
Complete the square: 4x² - 16x + 8
Answer: 4(x - 2)² - 8 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 13cm, angle = 80°. Give your answer to 2 decimal places
Answer: 160.03cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 12:42:35 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 73, 14, 42, 12, 31, 56, 71. Give your answer to 2 decimal places
Answer: Mean = 43.38, Median = 45, Range = 61