Keystones — Capstone
Five GCSE retrieval questions · 8 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √396
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: x² + 5x - 5
Answer: (x + 5⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 23cm, angle = 77°. Give your answer to 2 decimal places
Answer: 302.54cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 8:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 74, 87, 93, 45, 37, 17. Give your answer to 2 decimal places
Answer: Mean = 54.43, Median = 45, Range = 76