Keystones — Capstone
Five GCSE retrieval questions · 19 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √160
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: 5x² + 40x + 2
Answer: 5(x + 4)² - 78 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 28cm, angle = 74°. Give your answer to 2 decimal places
Answer: 161.49cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 25:20:24 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 97, 82, 59, 88, 42, 10, 86, 90
Answer: Mean = 63, Median = 82, Range = 87