Keystones — Capstone
Five GCSE retrieval questions · 16 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √275
Answer: 5√11 -
2. Algebra Completing the square
Complete the square: x² - 11x + 4
Answer: (x - 11⁄2)² - 105⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 27cm, angle = 46°. Give your answer to 2 decimal places
Answer: 213.64cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 12:10:15 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 35, 95, 35, 93, 10, 37, 72, 71. Give your answer to 2 decimal places
Answer: Mean = 51.22, Median = 37, Range = 85