Keystones — Capstone
Five GCSE retrieval questions · 20 February 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√250
Answer: 25√10 -
2. Algebra Completing the square
Complete the square: 4x² - 16x - 4
Answer: 4(x - 2)² - 20 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 14cm, angle = 71°. Give your answer to 2 decimal places
Answer: 112.52cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 35:20:8 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 63, 92, 27, 37, 84, 42, 80
Answer: Mean = 58.25, Median = 52.5, Range = 65