Keystones — Capstone
Five GCSE retrieval questions · 22 August 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: x² - 3x + 5
Answer: (x - 3⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 28cm, angle = 53°. Give your answer to 2 decimal places
Answer: 234.8cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 35:42:18 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 14, 72, 91, 99, 95, 86, 100
Answer: Mean = 72.25, Median = 88.5, Range = 86