Keystones — Capstone
Five GCSE retrieval questions · 8 July 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √216
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: 3x² - 18x + 8
Answer: 3(x - 3)² - 19 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 16cm, angle = 68°. Give your answer to 2 decimal places
Answer: 207.69cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 12:15:20 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 14, 59, 22, 41, 46, 74, 26, 50. Give your answer to 2 decimal places
Answer: Mean = 40.22, Median = 41, Range = 60