Keystones — Capstone
Five GCSE retrieval questions · 19 August 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√28
Answer: 4√7 -
2. Algebra Completing the square
Complete the square: 5x² + 40x - 8
Answer: 5(x + 4)² - 88 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 12cm, angle = 61°. Give your answer to 2 decimal places
Answer: 131.19cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 54:63:49 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 81, 38, 17, 35, 28, 43, 80, 69. Give your answer to 2 decimal places
Answer: Mean = 50.33, Median = 43, Range = 64