Keystones — Capstone
Five GCSE retrieval questions · 7 September 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√275
Answer: 10√11 -
2. Algebra Completing the square
Complete the square: 3x² + 18x + 15
Answer: 3(x + 3)² - 12 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 13cm, angle = 74°. Give your answer to 2 decimal places
Answer: 162.45cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 24:15:25 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 57, 10, 63, 19, 98, 61. Give your answer to 2 decimal places
Answer: Mean = 56.29, Median = 61, Range = 88