Keystones — Capstone
Five GCSE retrieval questions · 12 March 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² - 9x + 2
Answer: (x - 9⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 22cm, angle = 79°. Give your answer to 2 decimal places
Answer: 161.97cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 16:12:27 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 21, 58, 58, 25, 38, 75, 15
Answer: Mean = 43.5, Median = 48, Range = 60