Keystones — Capstone
Five GCSE retrieval questions · 22 April 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √810
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: 4x² + 32x - 2
Answer: 4(x + 4)² - 66 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 24cm, angle = 78°. Give your answer to 2 decimal places
Answer: 246.49cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 25:35:14 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 36, 31, 46, 63, 39, 30, 64, 54. Give your answer to 2 decimal places
Answer: Mean = 44.78, Median = 40, Range = 34