Keystones — Capstone
Five GCSE retrieval questions · 28 October 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √1000
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: 5x² + 10x - 5
Answer: 5(x + 1)² - 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 29cm, angle = 50°. Give your answer to 2 decimal places
Answer: 311.01cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 15:40:56 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 59, 16, 21, 58, 98, 66, 46, 31. Give your answer to 2 decimal places
Answer: Mean = 46.44, Median = 46, Range = 82