Keystones — Capstone
Five GCSE retrieval questions · 15 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √180
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: 3x² + 6x - 8
Answer: 3(x + 1)² - 11 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 18cm, angle = 63°. Give your answer to 2 decimal places
Answer: 168.4cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 16:14:63 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 85, 14, 16, 90, 77, 65, 52
Answer: Mean = 59, Median = 69, Range = 76