Keystones — Capstone
Five GCSE retrieval questions · 7 April 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² - 11x - 10
Answer: (x - 11⁄2)² - 161⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 15cm, angle = 61°. Give your answer to 2 decimal places
Answer: 118.07cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 5:35:7 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 47, 13, 28, 90, 37, 47. Give your answer to 2 decimal places
Answer: Mean = 41.14, Median = 37, Range = 77