Keystones — Capstone
Five GCSE retrieval questions · 10 November 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √240
Answer: 4√15 -
2. Algebra Completing the square
Complete the square: 4x² - 40x - 11
Answer: 4(x - 5)² - 111 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 20cm, angle = 56°. Give your answer to 2 decimal places
Answer: 116.07cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 27:63:14 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 93, 80, 12, 15, 28, 84, 32, 25. Give your answer to 2 decimal places
Answer: Mean = 43.11, Median = 28, Range = 81