Keystones — Capstone
Five GCSE retrieval questions · 9 March 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√45
Answer: 15√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 = 13cm, b = 28cm, angle = 79°. Give your answer to 2 decimal places
Answer: 178.66cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 27:24:4 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 30, 47, 57, 77, 33, 68. Give your answer to 2 decimal places
Answer: Mean = 48.29, Median = 47, Range = 51