Keystones — Capstone
Five GCSE retrieval questions · 7 September 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √1000
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: 2x² - 16x + 6
Answer: 2(x - 4)² - 26 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 22cm, angle = 44°. Give your answer to 2 decimal places
Answer: 168.11cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 6:21:7 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 79, 84, 20, 57, 98, 47, 31. Give your answer to 2 decimal places
Answer: Mean = 60.88, Median = 64, Range = 78