Keystones — Capstone
Five GCSE retrieval questions · 25 February 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √525
Answer: 5√21 -
2. Algebra Completing the square
Complete the square: 5x² - 20x - 4
Answer: 5(x - 2)² - 24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 12cm, angle = 75°. Give your answer to 2 decimal places
Answer: 121.71cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 27:63:28 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 97, 98, 60, 83, 85, 14, 27, 32. Give your answer to 2 decimal places
Answer: Mean = 63.11, Median = 72, Range = 84