Keystones — Capstone
Five GCSE retrieval questions · 11 February 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√45
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: 4x² + 48x + 2
Answer: 4(x + 6)² - 142 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 28cm, angle = 70°. Give your answer to 2 decimal places
Answer: 249.96cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 42:35:25 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 30, 81, 66, 68, 49, 11, 38
Answer: Mean = 44.5, Median = 43.5, Range = 70