Keystones — Capstone
Five GCSE retrieval questions · 14 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √1000
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: 4x² - 48x - 15
Answer: 4(x - 6)² - 159 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 24cm, angle = 73°. Give your answer to 2 decimal places
Answer: 149.18cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 35:42:30 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 80, 30, 70, 77, 93, 33. Give your answer to 2 decimal places
Answer: Mean = 63.71, Median = 70, Range = 63