Keystones — Capstone
Five GCSE retrieval questions · 13 March 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: 5x² + 20x + 15
Answer: 5(x + 2)² - 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 14cm, angle = 78°. Give your answer to 2 decimal places
Answer: 102.71cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 5:40:64 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 97, 77, 12, 79, 41, 73, 62, 85. Give your answer to 2 decimal places
Answer: Mean = 62.44, Median = 73, Range = 85