Keystones — Capstone
Five GCSE retrieval questions · 1 July 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √640
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: 3x² - 30x - 6
Answer: 3(x - 5)² - 81 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 27cm, angle = 63°. Give your answer to 2 decimal places
Answer: 192.46cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 7:42:48 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 21, 66, 92, 88, 72, 62, 83
Answer: Mean = 70.75, Median = 77, Range = 71