Keystones — Capstone
Five GCSE retrieval questions · 26 April 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√75
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: 2x² + 16x - 15
Answer: 2(x + 4)² - 47 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 12cm, angle = 72°. Give your answer to 2 decimal places
Answer: 102.71cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 7:63:18 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 92, 66, 83, 64, 63, 77, 71, 24. Give your answer to 2 decimal places
Answer: Mean = 64.11, Median = 66, Range = 68