Keystones — Capstone
Five GCSE retrieval questions · 6 February 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√48
Answer: 16√3 -
2. Algebra Completing the square
Complete the square: 2x² - 16x - 13
Answer: 2(x - 4)² - 45 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 17cm, angle = 73°. Give your answer to 2 decimal places
Answer: 170.7cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 21:14:16 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 63, 52, 53, 46, 82, 87. Give your answer to 2 decimal places
Answer: Mean = 68.14, Median = 63, Range = 48