Keystones — Capstone
Five GCSE retrieval questions · 9 April 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √160
Answer: 4√10 -
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 = 29cm, b = 25cm, angle = 48°. Give your answer to 2 decimal places
Answer: 269.39cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 56:24:21 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 16, 69, 23, 22, 51, 12, 74. Give your answer to 2 decimal places
Answer: Mean = 34.63, Median = 22.5, Range = 64