Keystones — Capstone
Five GCSE retrieval questions · 16 January 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √50
Answer: 5√2 -
2. Algebra Completing the square
Complete the square: x² - 7x + 5
Answer: (x - 7⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 18cm, angle = 48°. Give your answer to 2 decimal places
Answer: 160.52cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 8:6:3 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 85, 99, 76, 39, 94, 64, 28, 29. Give your answer to 2 decimal places
Answer: Mean = 62.78, Median = 64, Range = 71