Keystones — Capstone
Five GCSE retrieval questions · 2 December 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√8
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² - 5x - 8
Answer: (x - 5⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 16cm, angle = 79°. Give your answer to 2 decimal places
Answer: 117.8cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 35:45:27 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 42, 58, 100, 14, 15, 47. Give your answer to 2 decimal places
Answer: Mean = 48.29, Median = 47, Range = 86