Keystones — Capstone
Five GCSE retrieval questions · 3 July 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√80
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: 2x² - 8x - 4
Answer: 2(x - 2)² - 12 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 25cm, angle = 61°. Give your answer to 2 decimal places
Answer: 229.59cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 10:6:21 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 23, 39, 22, 77, 24, 99. Give your answer to 2 decimal places
Answer: Mean = 45.57, Median = 35, Range = 77