Keystones — Capstone
Five GCSE retrieval questions · 6 April 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √80
Answer: 4√5 -
2. Algebra Completing the square
Complete the square: x² - 11x + 7
Answer: (x - 11⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 24cm, angle = 40°. Give your answer to 2 decimal places
Answer: 138.84cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 4:14:21 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 38, 89, 65, 26, 90, 38, 95. Give your answer to 2 decimal places
Answer: Mean = 62.13, Median = 60.5, Range = 69