Keystones — Capstone
Five GCSE retrieval questions · 20 March 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √208
Answer: 4√13 -
2. Algebra Completing the square
Complete the square: 3x² - 24x - 11
Answer: 3(x - 4)² - 59 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 21cm, angle = 44°. Give your answer to 2 decimal places
Answer: 153.17cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 4:12:9 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 52, 45, 54, 77, 100, 63, 53, 56. Give your answer to 2 decimal places
Answer: Mean = 58.11, Median = 54, Range = 77