Keystones — Capstone
Five GCSE retrieval questions · 3 September 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √396
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: 3x² - 18x + 11
Answer: 3(x - 3)² - 16 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 21cm, angle = 60°. Give your answer to 2 decimal places
Answer: 190.96cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 12:10:5 -
5. Statistics Averages and range
Find the mean, median and range of: 42, 92, 40, 15, 33, 41, 78, 42, 22
Answer: Mean = 45, Median = 41, Range = 77