Keystones — Capstone
Five GCSE retrieval questions · 2 March 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√45
Answer: 9√5 -
2. Algebra Completing the square
Complete the square: x² - 11x + 7
Answer: (x - 11⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 15cm, angle = 74°. Give your answer to 2 decimal places
Answer: 209.07cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 27:6:4 -
5. Statistics Averages and range
Find the mean, median and range of: 75, 89, 83, 46, 79, 28, 25, 97
Answer: Mean = 65.25, Median = 77, Range = 72