Keystones — Capstone
Five GCSE retrieval questions · 12 March 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√160
Answer: 16√10 -
2. Algebra Completing the square
Complete the square: 4x² - 8x + 13
Answer: 4(x - 1)² + 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 21cm, angle = 56°. Give your answer to 2 decimal places
Answer: 113.16cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 35:14:18 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 77, 64, 71, 99, 61, 89, 83, 30
Answer: Mean = 72, Median = 74, Range = 69