Keystones — Capstone
Five GCSE retrieval questions · 12 June 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √252
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: x² - 5x - 8
Answer: (x - 5⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 21cm, angle = 58°. Give your answer to 2 decimal places
Answer: 267.14cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 4:12:9 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 67, 34, 70, 91, 93, 81. Give your answer to 2 decimal places
Answer: Mean = 67.14, Median = 70, Range = 59