Keystones — Capstone
Five GCSE retrieval questions · 20 May 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √686
Answer: 7√14 -
2. Algebra Completing the square
Complete the square: 2x² + 8x - 5
Answer: 2(x + 2)² - 13 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 25cm, angle = 54°. Give your answer to 2 decimal places
Answer: 242.71cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 10:45:36 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 39, 81, 22, 11, 58, 39
Answer: Mean = 45, Median = 39, Range = 70