Keystones — Capstone
Five GCSE retrieval questions · 6 May 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √160
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: x² - 11x + 10
Answer: (x - 11⁄2)² - 81⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 22cm, angle = 61°. Give your answer to 2 decimal places
Answer: 279cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 4:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 59, 58, 62, 100, 67, 87, 21, 28. Give your answer to 2 decimal places
Answer: Mean = 60.22, Median = 60, Range = 79