Keystones — Capstone
Five GCSE retrieval questions · 9 October 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: 4x² + 24x - 3
Answer: 4(x + 3)² - 39 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 20cm, angle = 40°. Give your answer to 2 decimal places
Answer: 109.27cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 4:18:9 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 29, 38, 36, 16, 36, 88, 61
Answer: Mean = 45.25, Median = 37, Range = 72