Keystones — Capstone
Five GCSE retrieval questions · 24 February 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √550
Answer: 5√22 -
2. Algebra Completing the square
Complete the square: 2x² + 20x
Answer: 2(x + 5)² - 50 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 22cm, angle = 46°. Give your answer to 2 decimal places
Answer: 181.99cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 27:15:20 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 95, 17, 93, 19, 15, 98. Give your answer to 2 decimal places
Answer: Mean = 51.71, Median = 25, Range = 83