Keystones — Capstone
Five GCSE retrieval questions · 24 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √50
Answer: 5√2 -
2. Algebra Completing the square
Complete the square: 5x² + 30x + 5
Answer: 5(x + 3)² - 40 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 27cm, angle = 50°. Give your answer to 2 decimal places
Answer: 248.2cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 56:21:18 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 44, 93, 51, 30, 81, 36, 34, 46. Give your answer to 2 decimal places
Answer: Mean = 52.67, Median = 46, Range = 63