Keystones — Capstone
Five GCSE retrieval questions · 17 October 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √567
Answer: 9√7 -
2. Algebra Completing the square
Complete the square: 2x² + 4x - 13
Answer: 2(x + 1)² - 15 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 24cm, angle = 68°. Give your answer to 2 decimal places
Answer: 222.52cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 48:40:25 -
5. Statistics Averages and range
Find the mean, median and range of: 42, 34, 74, 14, 79, 42, 24. Give your answer to 2 decimal places
Answer: Mean = 44.14, Median = 42, Range = 65