Keystones — Capstone
Five GCSE retrieval questions · 26 August 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √336
Answer: 4√21 -
2. Algebra Completing the square
Complete the square: x² - 7x - 11
Answer: (x - 7⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 21cm, angle = 78°. Give your answer to 2 decimal places
Answer: 215.68cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 16:10:15 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 20, 38, 74, 93, 67, 83, 48, 32. Give your answer to 2 decimal places
Answer: Mean = 60.11, Median = 67, Range = 73