Keystones — Capstone
Five GCSE retrieval questions · 31 December 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: 3x² + 24x + 11
Answer: 3(x + 4)² - 37 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 23cm, angle = 74°. Give your answer to 2 decimal places
Answer: 276.36cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 20:15:6 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 79, 66, 55, 64, 35, 37, 56, 63. Give your answer to 2 decimal places
Answer: Mean = 61.56, Median = 63, Range = 64