Keystones — Capstone
Five GCSE retrieval questions · 10 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: 4x² + 48x + 9
Answer: 4(x + 6)² - 135 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 25cm, angle = 42°. Give your answer to 2 decimal places
Answer: 192.38cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 28:35:45 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 52, 14, 65, 28, 72, 24, 38, 68. Give your answer to 2 decimal places
Answer: Mean = 49.11, Median = 52, Range = 67