Keystones — Capstone
Five GCSE retrieval questions · 2 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √405
Answer: 9√5 -
2. Algebra Completing the square
Complete the square: x² - x - 2
Answer: (x - 1⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 28cm, angle = 65°. Give your answer to 2 decimal places
Answer: 342.58cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 12:21:28 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 40, 57, 61, 68, 30, 42, 24, 46. Give your answer to 2 decimal places
Answer: Mean = 44.22, Median = 42, Range = 44