Keystones — Capstone
Five GCSE retrieval questions · 6 February 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² + 7x - 2
Answer: (x + 7⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 17cm, angle = 58°. Give your answer to 2 decimal places
Answer: 158.58cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 7:35:15 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 99, 34, 17, 99, 29, 89, 22
Answer: Mean = 58.5, Median = 56.5, Range = 82