Keystones — Capstone
Five GCSE retrieval questions · 24 September 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √384
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: 4x² + 24x + 13
Answer: 4(x + 3)² - 23 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 20cm, angle = 75°. Give your answer to 2 decimal places
Answer: 173.87cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 3:24:16 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 99, 35, 82, 34, 89, 66, 36
Answer: Mean = 56.75, Median = 51, Range = 86