Keystones — Capstone
Five GCSE retrieval questions · 29 July 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √600
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: 5x² - 40x + 13
Answer: 5(x - 4)² - 67 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 23cm, angle = 45°. Give your answer to 2 decimal places
Answer: 219.56cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 63:56:32 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 62, 73, 72, 89, 70, 30
Answer: Mean = 70, Median = 72, Range = 64