Keystones — Capstone
Five GCSE retrieval questions · 24 January 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√40
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: 3x² - 18x - 10
Answer: 3(x - 3)² - 37 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 20cm, angle = 53°. Give your answer to 2 decimal places
Answer: 191.67cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 15:18:16 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 69, 87, 85, 17, 57, 50, 48
Answer: Mean = 53, Median = 53.5, Range = 76