Keystones — Capstone
Five GCSE retrieval questions · 27 July 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √176
Answer: 4√11 -
2. Algebra Completing the square
Complete the square: x² - 11x + 9
Answer: (x - 11⁄2)² - 85⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 15cm, angle = 61°. Give your answer to 2 decimal places
Answer: 131.19cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 20:35:14 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 24, 78, 36, 43, 89, 18, 84
Answer: Mean = 50, Median = 39.5, Range = 71