Keystones — Capstone
Five GCSE retrieval questions · 4 July 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √504
Answer: 6√14 -
2. Algebra Completing the square
Complete the square: 5x² + 40x + 10
Answer: 5(x + 4)² - 70 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 29cm, angle = 49°. Give your answer to 2 decimal places
Answer: 186.04cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 81:36:8 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 100, 22, 43, 53, 15, 41. Give your answer to 2 decimal places
Answer: Mean = 41.86, Median = 41, Range = 85