Keystones — Capstone
Five GCSE retrieval questions · 28 February 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√18
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 11x
Answer: (x + 11⁄2)² - 121⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 24cm, angle = 47°. Give your answer to 2 decimal places
Answer: 105.31cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 45:18:8 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 25, 24, 74, 79, 11, 70. Give your answer to 2 decimal places
Answer: Mean = 44.86, Median = 31, Range = 68