Keystones — Capstone
Five GCSE retrieval questions · 2 June 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √245
Answer: 7√5 -
2. Algebra Completing the square
Complete the square: 3x² - 18x + 12
Answer: 3(x - 3)² - 15 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 16cm, angle = 77°. Give your answer to 2 decimal places
Answer: 93.54cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 40:35:21 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 88, 68, 99, 54, 86, 19, 40, 71
Answer: Mean = 64, Median = 68, Range = 80