Keystones — Capstone
Five GCSE retrieval questions · 21 August 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
2. Algebra Completing the square
Complete the square: 5x² - 10x + 3
Answer: 5(x - 1)² - 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 26cm, angle = 55°. Give your answer to 2 decimal places
Answer: 223.63cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 27:72:64 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 97, 88, 17, 17, 41, 22, 44, 70. Give your answer to 2 decimal places
Answer: Mean = 52.89, Median = 44, Range = 80