Keystones — Capstone
Five GCSE retrieval questions · 5 August 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: 4x² - 24x - 12
Answer: 4(x - 3)² - 48 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 15cm, angle = 40°. Give your answer to 2 decimal places
Answer: 120.52cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 48:40:35 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 28, 51, 19, 45, 88, 55, 94, 89. Give your answer to 2 decimal places
Answer: Mean = 58.67, Median = 55, Range = 75