Keystones — Capstone
Five GCSE retrieval questions · 21 April 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √175
Answer: 5√7 -
2. Algebra Completing the square
Complete the square: x² - 9x - 1
Answer: (x - 9⁄2)² - 85⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 12cm, angle = 74°. Give your answer to 2 decimal places
Answer: 149.96cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 5:10:8 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 94, 30, 31, 13, 38, 32, 63, 99. Give your answer to 2 decimal places
Answer: Mean = 46.33, Median = 32, Range = 86