Keystones — Capstone
Five GCSE retrieval questions · 13 September 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √525
Answer: 5√21 -
2. Algebra Completing the square
Complete the square: 2x² - 12x - 10
Answer: 2(x - 3)² - 28 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 20cm, angle = 72°. Give your answer to 2 decimal places
Answer: 123.64cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 32:28:21 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 60, 26, 90, 61, 91, 14, 34. Give your answer to 2 decimal places
Answer: Mean = 56.88, Median = 60.5, Range = 77