Keystones — Capstone
Five GCSE retrieval questions · 20 January 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √240
Answer: 4√15 -
2. Algebra Completing the square
Complete the square: 3x² + 6x - 5
Answer: 3(x + 1)² - 8 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 29cm, angle = 67°. Give your answer to 2 decimal places
Answer: 160.17cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 40:15:18 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 30, 63, 71, 80, 13, 67, 94
Answer: Mean = 61.5, Median = 69, Range = 81