Keystones — Capstone
Five GCSE retrieval questions · 20 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √640
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: 5x² - 50x - 8
Answer: 5(x - 5)² - 133 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 29cm, angle = 41°. Give your answer to 2 decimal places
Answer: 218.8cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 81:36:16 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 66, 25, 32, 85, 85, 85, 38. Give your answer to 2 decimal places
Answer: Mean = 56.13, Median = 52, Range = 60