Keystones — Capstone
Five GCSE retrieval questions · 16 March 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √405
Answer: 9√5 -
2. Algebra Completing the square
Complete the square: 3x² + 24x - 8
Answer: 3(x + 4)² - 56 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 29cm, angle = 64°. Give your answer to 2 decimal places
Answer: 338.85cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 81:18:16 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 38, 77, 72, 35, 76, 36, 79. Give your answer to 2 decimal places
Answer: Mean = 63.63, Median = 74, Range = 61