Keystones — Capstone
Five GCSE retrieval questions · 15 September 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √540
Answer: 6√15 -
2. Algebra Completing the square
Complete the square: 5x² + 30x + 6
Answer: 5(x + 3)² - 39 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 17cm, angle = 40°. Give your answer to 2 decimal places
Answer: 109.27cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 35:21:18 -
5. Statistics Averages and range
Find the mean, median and range of: 42, 64, 91, 24, 99, 52, 32. Give your answer to 2 decimal places
Answer: Mean = 57.71, Median = 52, Range = 75