Keystones — Capstone
Five GCSE retrieval questions · 12 December 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: x² - 11x + 2
Answer: (x - 11⁄2)² - 113⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 19cm, angle = 42°. Give your answer to 2 decimal places
Answer: 139.85cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 27:15:5 -
5. Statistics Averages and range
Find the mean, median and range of: 42, 86, 59, 59, 88, 16, 44, 42
Answer: Mean = 54.5, Median = 51.5, Range = 72