Keystones — Capstone
Five GCSE retrieval questions · 21 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √375
Answer: 5√15 -
2. Algebra Completing the square
Complete the square: 5x² - 50x - 9
Answer: 5(x - 5)² - 134 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 20cm, angle = 65°. Give your answer to 2 decimal places
Answer: 190.32cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 64:72:9 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 37, 28, 35, 52, 20, 53, 69
Answer: Mean = 41.25, Median = 36.5, Range = 49