Keystones — Capstone
Five GCSE retrieval questions · 17 October 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √245
Answer: 7√5 -
2. Algebra Completing the square
Complete the square: 4x² + 16x + 12
Answer: 4(x + 2)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 21cm, angle = 58°. Give your answer to 2 decimal places
Answer: 169.19cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 4:6:3 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 69, 100, 24, 96, 42, 68, 14, 86. Give your answer to 2 decimal places
Answer: Mean = 58.11, Median = 68, Range = 86