Keystones — Capstone
Five GCSE retrieval questions · 3 September 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: 3x² - 18x - 11
Answer: 3(x - 3)² - 38 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 14cm, angle = 40°. Give your answer to 2 decimal places
Answer: 85.49cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 21:24:16 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 19, 88, 19, 56, 23, 76, 100, 61
Answer: Mean = 57, Median = 61, Range = 81