Keystones — Capstone
Five GCSE retrieval questions · 17 September 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √375
Answer: 5√15 -
2. Algebra Completing the square
Complete the square: 2x² + 12x + 13
Answer: 2(x + 3)² - 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 22cm, angle = 41°. Give your answer to 2 decimal places
Answer: 122.68cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 64:72:45 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 84, 11, 35, 52, 77, 61, 75, 86. Give your answer to 2 decimal places
Answer: Mean = 56.56, Median = 61, Range = 75