Keystones — Capstone
Five GCSE retrieval questions · 30 October 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√20
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: 4x² + 16x + 15
Answer: 4(x + 2)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 18cm, angle = 70°. Give your answer to 2 decimal places
Answer: 109.94cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 49:14:18 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 31, 96, 70, 41, 85, 39. Give your answer to 2 decimal places
Answer: Mean = 64.14, Median = 70, Range = 65