Keystones — Capstone
Five GCSE retrieval questions · 8 May 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √363
Answer: 11√3 -
2. Algebra Completing the square
Complete the square: 5x² - 40x + 1
Answer: 5(x - 4)² - 79 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 19cm, angle = 74°. Give your answer to 2 decimal places
Answer: 136.98cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 7:63:27 -
5. Statistics Averages and range
Find the mean, median and range of: 42, 78, 95, 57, 90, 73, 61, 26, 60. Give your answer to 2 decimal places
Answer: Mean = 64.67, Median = 61, Range = 69