Keystones — Capstone
Five GCSE retrieval questions · 22 February 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: x² - 7x + 1
Answer: (x - 7⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 28cm, angle = 44°. Give your answer to 2 decimal places
Answer: 243.13cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 35:42:48 -
5. Statistics Averages and range
Find the mean, median and range of: 77, 15, 68, 79, 69, 93, 74. Give your answer to 2 decimal places
Answer: Mean = 67.86, Median = 74, Range = 78