Keystones — Capstone
Five GCSE retrieval questions · 1 September 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√20
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² - 3x - 3
Answer: (x - 3⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 27cm, angle = 51°. Give your answer to 2 decimal places
Answer: 304.25cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 35:42:30 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 29, 51, 60, 77, 23, 25, 67, 80. Give your answer to 2 decimal places
Answer: Mean = 49.22, Median = 51, Range = 57