Keystones — Capstone
Five GCSE retrieval questions · 11 April 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √1000
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: 3x² - 36x - 10
Answer: 3(x - 6)² - 118 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 21cm, angle = 47°. Give your answer to 2 decimal places
Answer: 122.87cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 56:72:63 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 54, 39, 46, 33, 11, 96, 32. Give your answer to 2 decimal places
Answer: Mean = 47.63, Median = 42.5, Range = 85