Keystones — Capstone
Five GCSE retrieval questions · 12 September 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √112
Answer: 4√7 -
2. Algebra Completing the square
Complete the square: x² - 3x + 10
Answer: (x - 3⁄2)² + 31⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 26cm, angle = 66°. Give your answer to 2 decimal places
Answer: 261.27cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 72:63:49 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 84, 13, 55, 27, 27, 97, 33, 59. Give your answer to 2 decimal places
Answer: Mean = 45.11, Median = 33, Range = 86