Keystones — Capstone
Five GCSE retrieval questions · 23 July 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√112
Answer: 16√7 -
2. Algebra Completing the square
Complete the square: x² + 9x - 8
Answer: (x + 9⁄2)² - 113⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 21cm, angle = 65°. Give your answer to 2 decimal places
Answer: 237.91cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 49:42:54 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 71, 20, 81, 45, 28, 70, 76
Answer: Mean = 52, Median = 57.5, Range = 61