Keystones — Capstone
Five GCSE retrieval questions · 26 December 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√48
Answer: 16√3 -
2. Algebra Completing the square
Complete the square: x² + 7x + 6
Answer: (x + 7⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 24cm, angle = 73°. Give your answer to 2 decimal places
Answer: 149.18cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 2:10:35 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 57, 95, 11, 31, 39, 77, 42
Answer: Mean = 45.75, Median = 40.5, Range = 84