Keystones — Capstone
Five GCSE retrieval questions · 6 November 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √360
Answer: 6√10 -
2. Algebra Completing the square
Complete the square: 2x² + 8x + 4
Answer: 2(x + 2)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 23cm, angle = 75°. Give your answer to 2 decimal places
Answer: 255.49cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 7:42:54 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 68, 44, 74, 73, 23, 78. Give your answer to 2 decimal places
Answer: Mean = 59.86, Median = 68, Range = 55