Keystones — Capstone
Five GCSE retrieval questions · 6 March 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √272
Answer: 4√17 -
2. Algebra Completing the square
Complete the square: x² + 11x + 2
Answer: (x + 11⁄2)² - 113⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 19cm, angle = 79°. Give your answer to 2 decimal places
Answer: 149.21cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 25:10:12 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 13, 92, 76, 94, 19, 18, 67, 73. Give your answer to 2 decimal places
Answer: Mean = 57.78, Median = 68, Range = 81