Keystones — Capstone
Five GCSE retrieval questions · 10 March 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √756
Answer: 6√21 -
2. Algebra Completing the square
Complete the square: 4x² + 40x - 3
Answer: 4(x + 5)² - 103 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 30cm, angle = 69°. Give your answer to 2 decimal places
Answer: 308.08cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 32:24:3 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 43, 22, 47, 78, 18, 72
Answer: Mean = 48, Median = 47, Range = 60