Keystones — Capstone
Five GCSE retrieval questions · 3 May 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √250
Answer: 5√10 -
2. Algebra Completing the square
Complete the square: 4x² - 24x - 2
Answer: 4(x - 3)² - 38 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 23cm, angle = 66°. Give your answer to 2 decimal places
Answer: 210.12cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 3:12:10 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 96, 90, 78, 28, 93, 21, 90
Answer: Mean = 66.25, Median = 84, Range = 75