Keystones — Capstone
Five GCSE retrieval questions · 18 February 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √756
Answer: 6√21 -
2. Algebra Completing the square
Complete the square: 3x² + 36x + 5
Answer: 3(x + 6)² - 103 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 26cm, angle = 61°. Give your answer to 2 decimal places
Answer: 204.66cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 7:28:16 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 78, 67, 56, 44, 70, 32. Give your answer to 2 decimal places
Answer: Mean = 54.29, Median = 56, Range = 46