Keystones — Capstone
Five GCSE retrieval questions · 1 April 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √486
Answer: 9√6 -
2. Algebra Completing the square
Complete the square: 3x² - 36x - 3
Answer: 3(x - 6)² - 111 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 23cm, angle = 57°. Give your answer to 2 decimal places
Answer: 183.25cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 20:28:49 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 12, 73, 66, 57, 50, 54. Give your answer to 2 decimal places
Answer: Mean = 52.71, Median = 57, Range = 61