Keystones — Capstone
Five GCSE retrieval questions · 28 February 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: 3x² - 24x + 6
Answer: 3(x - 4)² - 42 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 25cm, angle = 72°. Give your answer to 2 decimal places
Answer: 344.76cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 15:35:14 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 96, 63, 88, 68, 79, 99, 68. Give your answer to 2 decimal places
Answer: Mean = 80.63, Median = 81.5, Range = 36