Keystones — Capstone
Five GCSE retrieval questions · 20 February 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √208
Answer: 4√13 -
2. Algebra Completing the square
Complete the square: x² + 5x - 8
Answer: (x + 5⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 15cm, angle = 41°. Give your answer to 2 decimal places
Answer: 83.65cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 16:20:25 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 34, 49, 23, 34, 46, 67, 15, 52. Give your answer to 2 decimal places
Answer: Mean = 37.22, Median = 34, Range = 52