Keystones — Capstone
Five GCSE retrieval questions · 10 January 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √112
Answer: 4√7 -
2. Algebra Completing the square
Complete the square: 3x² + 24x + 3
Answer: 3(x + 4)² - 45 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 29cm, angle = 43°. Give your answer to 2 decimal places
Answer: 247.22cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 36:20:45 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 91, 42, 99, 35, 84, 76. Give your answer to 2 decimal places
Answer: Mean = 71.86, Median = 76, Range = 64