Keystones — Capstone
Five GCSE retrieval questions · 23 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √96
Answer: 4√6 -
2. Algebra Completing the square
Complete the square: 5x² + 30x + 2
Answer: 5(x + 3)² - 43 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 24cm, angle = 61°. Give your answer to 2 decimal places
Answer: 262.39cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 21:24:8 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 76, 18, 45, 53, 61, 16, 76, 10. Give your answer to 2 decimal places
Answer: Mean = 41.11, Median = 45, Range = 66