Keystones — Capstone
Five GCSE retrieval questions · 13 February 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√8
Answer: 4√2 -
2. Algebra Completing the square
Complete the square: 4x² + 48x - 1
Answer: 4(x + 6)² - 145 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 21cm, angle = 55°. Give your answer to 2 decimal places
Answer: 189.22cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 3:24:56 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 70, 47, 99, 34, 69, 91
Answer: Mean = 67, Median = 69, Range = 65