Keystones — Capstone
Five GCSE retrieval questions · 12 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √833
Answer: 7√17 -
2. Algebra Completing the square
Complete the square: 4x² - 40x - 14
Answer: 4(x - 5)² - 114 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 27cm, angle = 79°. Give your answer to 2 decimal places
Answer: 331.3cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 8:72:27 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 44, 84, 99, 98, 61, 65, 75. Give your answer to 2 decimal places
Answer: Mean = 69.63, Median = 70, Range = 68