Keystones — Capstone
Five GCSE retrieval questions · 23 June 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√45
Answer: 15√5 -
2. Algebra Completing the square
Complete the square: 5x² - 20x + 4
Answer: 5(x - 2)² - 16 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 24cm, angle = 45°. Give your answer to 2 decimal places
Answer: 254.56cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 30:42:35 -
5. Statistics Averages and range
Find the mean, median and range of: 32, 16, 86, 26, 68, 24, 79. Give your answer to 2 decimal places
Answer: Mean = 47.29, Median = 32, Range = 70