Keystones — Capstone
Five GCSE retrieval questions · 21 November 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √175
Answer: 5√7 -
2. Algebra Completing the square
Complete the square: 2x² + 24x - 3
Answer: 2(x + 6)² - 75 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 23cm, angle = 69°. Give your answer to 2 decimal places
Answer: 225.46cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 35:42:6 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 86, 88, 38, 85, 38, 61. Give your answer to 2 decimal places
Answer: Mean = 64.29, Median = 61, Range = 50