Keystones — Capstone
Five GCSE retrieval questions · 26 October 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √250
Answer: 5√10 -
2. Algebra Completing the square
Complete the square: 2x² + 4x - 14
Answer: 2(x + 1)² - 16 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 23cm, angle = 73°. Give your answer to 2 decimal places
Answer: 219.95cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 10:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 53, 42, 68, 49, 17, 51, 63, 65. Give your answer to 2 decimal places
Answer: Mean = 50.78, Median = 51, Range = 51