Keystones — Capstone
Five GCSE retrieval questions · 26 April 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √300
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: x² + 11x - 10
Answer: (x + 11⁄2)² - 161⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 22cm, angle = 78°. Give your answer to 2 decimal places
Answer: 150.63cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 9:24:28 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 81, 67, 61, 37, 56, 88. Give your answer to 2 decimal places
Answer: Mean = 62.14, Median = 61, Range = 51