Keystones — Capstone
Five GCSE retrieval questions · 19 October 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √375
Answer: 5√15 -
2. Algebra Completing the square
Complete the square: x² - 9x - 8
Answer: (x - 9⁄2)² - 113⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 23cm, angle = 73°. Give your answer to 2 decimal places
Answer: 142.97cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 5:40:64 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 99, 27, 60, 65, 79, 100, 56, 50. Give your answer to 2 decimal places
Answer: Mean = 67.22, Median = 65, Range = 73