Keystones — Capstone
Five GCSE retrieval questions · 23 January 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√160
Answer: 20√10 -
2. Algebra Completing the square
Complete the square: 4x² - 16x - 1
Answer: 4(x - 2)² - 17 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 26cm, angle = 44°. Give your answer to 2 decimal places
Answer: 216.73cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 49:28:12 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 64, 64, 45, 60, 93, 67, 86, 79. Give your answer to 2 decimal places
Answer: Mean = 64.78, Median = 64, Range = 68