Keystones — Capstone
Five GCSE retrieval questions · 2 September 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √792
Answer: 6√22 -
2. Algebra Completing the square
Complete the square: 4x² + 48x + 9
Answer: 4(x + 6)² - 135 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 21cm, angle = 53°. Give your answer to 2 decimal places
Answer: 159.33cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 36:45:10 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 71, 89, 46, 57, 82, 51, 100, 36. Give your answer to 2 decimal places
Answer: Mean = 61.67, Median = 57, Range = 77