Keystones — Capstone
Five GCSE retrieval questions · 15 October 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√80
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² - x - 5
Answer: (x - 1⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 18cm, angle = 63°. Give your answer to 2 decimal places
Answer: 224.53cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 14:10:45 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 22, 49, 32, 71, 97, 90. Give your answer to 2 decimal places
Answer: Mean = 54.57, Median = 49, Range = 76