Keystones — Capstone
Five GCSE retrieval questions · 12 June 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√75
Answer: 15√3 -
2. Algebra Completing the square
Complete the square: x² + 7x + 10
Answer: (x + 7⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 12cm, angle = 61°. Give your answer to 2 decimal places
Answer: 94.46cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 56:63:27 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 45, 100, 57, 52, 89, 66. Give your answer to 2 decimal places
Answer: Mean = 70.57, Median = 66, Range = 55