Keystones — Capstone
Five GCSE retrieval questions · 21 June 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √847
Answer: 11√7 -
2. Algebra Completing the square
Complete the square: 4x² - 48x - 13
Answer: 4(x - 6)² - 157 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 26cm, angle = 70°. Give your answer to 2 decimal places
Answer: 342.05cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 16:10:25 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 59, 58, 97, 24, 27, 100. Give your answer to 2 decimal places
Answer: Mean = 53.57, Median = 58, Range = 90