Keystones — Capstone
Five GCSE retrieval questions · 9 August 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √375
Answer: 5√15 -
2. Algebra Completing the square
Complete the square: x² + 11x + 7
Answer: (x + 11⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 28cm, angle = 58°. Give your answer to 2 decimal places
Answer: 189.96cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 12:10:15 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 46, 23, 87, 65, 84, 77, 81. Give your answer to 2 decimal places
Answer: Mean = 69.63, Median = 79, Range = 71