Keystones — Capstone
Five GCSE retrieval questions · 1 December 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √250
Answer: 5√10 -
2. Algebra Completing the square
Complete the square: x² - 11x + 3
Answer: (x - 11⁄2)² - 109⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 21cm, angle = 72°. Give your answer to 2 decimal places
Answer: 209.71cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 8:56:63 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 68, 77, 22, 57, 99, 65, 56, 37
Answer: Mean = 55, Median = 57, Range = 85