Keystones — Capstone
Five GCSE retrieval questions · 17 October 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√32
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: 3x² - 6x - 12
Answer: 3(x - 1)² - 15 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 20cm, angle = 40°. Give your answer to 2 decimal places
Answer: 186.41cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 20:28:7 -
5. Statistics Averages and range
Find the mean, median and range of: 44, 96, 41, 94, 87, 15, 47. Give your answer to 2 decimal places
Answer: Mean = 60.57, Median = 47, Range = 81