Keystones — Capstone
Five GCSE retrieval questions · 30 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: 5x² - 50x - 9
Answer: 5(x - 5)² - 134 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 25cm, angle = 79°. Give your answer to 2 decimal places
Answer: 233.14cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 30:35:14 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 87, 25, 79, 52, 71, 57, 24
Answer: Mean = 56.5, Median = 57, Range = 63