Keystones — Capstone
Five GCSE retrieval questions · 28 July 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² - 9x - 5
Answer: (x - 9⁄2)² - 101⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 29cm, angle = 53°. Give your answer to 2 decimal places
Answer: 185.28cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 16:18:15 -
5. Statistics Averages and range
Find the mean, median and range of: 42, 94, 89, 56, 69, 79, 81, 80, 37. Give your answer to 2 decimal places
Answer: Mean = 69.67, Median = 79, Range = 57