Keystones — Capstone
Five GCSE retrieval questions · 5 June 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √810
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: 5x² - 20x - 7
Answer: 5(x - 2)² - 27 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 13cm, angle = 75°. Give your answer to 2 decimal places
Answer: 188.36cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 64:72:81 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 94, 72, 15, 27, 72, 18. Give your answer to 2 decimal places
Answer: Mean = 54.57, Median = 72, Range = 79