Keystones — Capstone
Five GCSE retrieval questions · 1 June 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: 5x² - 60x + 5
Answer: 5(x - 6)² - 175 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 19cm, angle = 76°. Give your answer to 2 decimal places
Answer: 267.32cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 4:10:5 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 67, 47, 24, 28, 98, 35, 17, 74
Answer: Mean = 53, Median = 47, Range = 81