Keystones — Capstone
Five GCSE retrieval questions · 4 December 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √72
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: 4x² - 32x + 6
Answer: 4(x - 4)² - 58 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 25cm, angle = 57°. Give your answer to 2 decimal places
Answer: 304.02cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 7:63:45 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 70, 26, 58, 23, 14, 82. Give your answer to 2 decimal places
Answer: Mean = 44.14, Median = 36, Range = 68