Keystones — Capstone
Five GCSE retrieval questions · 23 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² + 5x + 4
Answer: (x + 5⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 12cm, angle = 79°. Give your answer to 2 decimal places
Answer: 135.46cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 2:6:27 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 26, 100, 60, 94, 58, 99, 47. Give your answer to 2 decimal places
Answer: Mean = 63.63, Median = 59, Range = 75