Keystones — Capstone
Five GCSE retrieval questions · 21 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√99
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: 4x² - 8x - 10
Answer: 4(x - 1)² - 14 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 22cm, angle = 40°. Give your answer to 2 decimal places
Answer: 155.55cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 49:63:45 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 12, 52, 18, 49, 72, 84, 53. Give your answer to 2 decimal places
Answer: Mean = 48.13, Median = 50.5, Range = 72