Keystones — Capstone
Five GCSE retrieval questions · 5 January 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √847
Answer: 11√7 -
2. Algebra Completing the square
Complete the square: 2x² - 8x - 10
Answer: 2(x - 2)² - 18 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 24cm, angle = 70°. Give your answer to 2 decimal places
Answer: 281.91cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 21:28:20 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 93, 38, 47, 40, 73, 76. Give your answer to 2 decimal places
Answer: Mean = 64.43, Median = 73, Range = 55