Keystones — Capstone
Five GCSE retrieval questions · 6 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√45
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: 5x² + 10x + 7
Answer: 5(x + 1)² + 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 21cm, angle = 62°. Give your answer to 2 decimal places
Answer: 259.59cm² -
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: 11, 25, 86, 95, 27, 56, 44, 59. Give your answer to 2 decimal places
Answer: Mean = 50.38, Median = 50, Range = 84