Keystones — Capstone
Five GCSE retrieval questions · 18 February 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√175
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: 4x² - 16x - 2
Answer: 4(x - 2)² - 18 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 21cm, angle = 55°. Give your answer to 2 decimal places
Answer: 120.42cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 9:45:10 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 98, 45, 95, 55, 27, 22, 70, 58. Give your answer to 2 decimal places
Answer: Mean = 56.33, Median = 55, Range = 76