Keystones — Capstone
Five GCSE retrieval questions · 17 April 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√48
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: 4x² - 8x + 5
Answer: 4(x - 1)² + 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 13cm, angle = 79°. Give your answer to 2 decimal places
Answer: 121.23cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 63:56:64 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 35, 35, 51, 69, 11, 92, 37, 68. Give your answer to 2 decimal places
Answer: Mean = 48.67, Median = 40, Range = 81