Keystones — Capstone
Five GCSE retrieval questions · 6 October 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √180
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: x² - x + 3
Answer: (x - 1⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 24cm, angle = 79°. Give your answer to 2 decimal places
Answer: 176.69cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 7:56:72 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 19, 20, 43, 63, 90, 98. Give your answer to 2 decimal places
Answer: Mean = 60.71, Median = 63, Range = 79