Keystones — Capstone
Five GCSE retrieval questions · 21 July 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√40
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: x² - 7x - 9
Answer: (x - 7⁄2)² - 85⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 21cm, angle = 67°. Give your answer to 2 decimal places
Answer: 202.97cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 7:35:40 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 55, 45, 57, 83, 16, 68
Answer: Mean = 54, Median = 55, Range = 67