Keystones — Capstone
Five GCSE retrieval questions · 20 November 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √1000
Answer: 10√10 -
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 = 23cm, b = 21cm, angle = 80°. Give your answer to 2 decimal places
Answer: 237.83cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 16:36:45 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 85, 72, 17, 56, 39, 68, 41, 87. Give your answer to 2 decimal places
Answer: Mean = 61.33, Median = 68, Range = 70