Keystones — Capstone
Five GCSE retrieval questions · 24 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √375
Answer: 5√15 -
2. Algebra Completing the square
Complete the square: 4x² + 48x + 5
Answer: 4(x + 6)² - 139 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 12cm, angle = 66°. Give your answer to 2 decimal places
Answer: 104.14cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 10:15:9 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 100, 57, 56, 76, 74, 18. Give your answer to 2 decimal places
Answer: Mean = 57.29, Median = 57, Range = 82