Keystones — Capstone
Five GCSE retrieval questions · 5 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: 2x² - 16x - 9
Answer: 2(x - 4)² - 41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 23cm, angle = 55°. Give your answer to 2 decimal places
Answer: 207.25cm² -
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: 69, 78, 22, 72, 35, 98, 22. Give your answer to 2 decimal places
Answer: Mean = 56.57, Median = 69, Range = 76