Keystones — Capstone
Five GCSE retrieval questions · 26 March 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √80
Answer: 4√5 -
2. Algebra Completing the square
Complete the square: 4x² + 40x
Answer: 4(x + 5)² - 100 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 21cm, angle = 80°. Give your answer to 2 decimal places
Answer: 175.79cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 5:30:24 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 75, 54, 88, 79, 85, 78, 93. Give your answer to 2 decimal places
Answer: Mean = 76.88, Median = 78.5, Range = 39