Keystones — Capstone
Five GCSE retrieval questions · 9 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √160
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: x² + 7x + 9
Answer: (x + 7⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 16cm, angle = 74°. Give your answer to 2 decimal places
Answer: 169.18cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 45:10:12 -
5. Statistics Averages and range
Find the mean, median and range of: 75, 43, 100, 57, 68, 10, 76, 94. Give your answer to 2 decimal places
Answer: Mean = 65.38, Median = 71.5, Range = 90