Keystones — Capstone
Five GCSE retrieval questions · 16 August 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: 2x² + 16x - 9
Answer: 2(x + 4)² - 41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 25cm, angle = 41°. Give your answer to 2 decimal places
Answer: 155.81cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 42:35:40 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 15, 29, 20, 32, 21, 61, 83. Give your answer to 2 decimal places
Answer: Mean = 40.38, Median = 30.5, Range = 68