Keystones — Capstone
Five GCSE retrieval questions · 15 September 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √294
Answer: 7√6 -
2. Algebra Completing the square
Complete the square: 3x² - 18x + 9
Answer: 3(x - 3)² - 18 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 21cm, angle = 69°. Give your answer to 2 decimal places
Answer: 215.66cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 45:72:56 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 71, 95, 38, 46, 58, 50. Give your answer to 2 decimal places
Answer: Mean = 62.43, Median = 58, Range = 57