Keystones — Capstone
Five GCSE retrieval questions · 19 July 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: 5x² + 60x - 13
Answer: 5(x + 6)² - 193 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 29cm, angle = 73°. Give your answer to 2 decimal places
Answer: 221.86cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 21:12:20 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 77, 37, 70, 12, 34, 17, 100, 76. Give your answer to 2 decimal places
Answer: Mean = 48.33, Median = 37, Range = 88