Keystones — Capstone
Five GCSE retrieval questions · 3 February 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √336
Answer: 4√21 -
2. Algebra Completing the square
Complete the square: 3x² - 12x - 14
Answer: 3(x - 2)² - 26 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 17cm, angle = 76°. Give your answer to 2 decimal places
Answer: 107.22cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 25:20:8 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 72, 56, 40, 33, 77, 77, 94, 86. Give your answer to 2 decimal places
Answer: Mean = 61.11, Median = 72, Range = 79