Keystones — Capstone
Five GCSE retrieval questions · 2 February 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √350
Answer: 5√14 -
2. Algebra Completing the square
Complete the square: 4x² + 16x + 5
Answer: 4(x + 2)² - 11 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 23cm, angle = 69°. Give your answer to 2 decimal places
Answer: 300.61cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 4:36:27 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 10, 54, 82, 26, 96, 45
Answer: Mean = 50, Median = 45, Range = 86