Keystones — Capstone
Five GCSE retrieval questions · 24 October 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √640
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: x² - 9x + 1
Answer: (x - 9⁄2)² - 77⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 17cm, angle = 48°. Give your answer to 2 decimal places
Answer: 164.24cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 49:35:5 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 27, 45, 42, 22, 53, 97, 31, 65. Give your answer to 2 decimal places
Answer: Mean = 51.89, Median = 45, Range = 75