Keystones — Capstone
Five GCSE retrieval questions · 13 May 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: 4x² - 24x - 8
Answer: 4(x - 3)² - 44 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 29cm, angle = 62°. Give your answer to 2 decimal places
Answer: 294.46cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 16:10:25 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 12, 36, 79, 85, 42, 94, 49, 80. Give your answer to 2 decimal places
Answer: Mean = 59.67, Median = 60, Range = 82