Keystones — Capstone
Five GCSE retrieval questions · 19 November 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √150
Answer: 5√6 -
2. Algebra Completing the square
Complete the square: x² - 5x - 9
Answer: (x - 5⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 19cm, angle = 44°. Give your answer to 2 decimal places
Answer: 158.38cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 32:36:9 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 26, 25, 71, 22, 35, 50. Give your answer to 2 decimal places
Answer: Mean = 35.71, Median = 26, Range = 50