Keystones — Capstone
Five GCSE retrieval questions · 3 December 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √250
Answer: 5√10 -
2. Algebra Completing the square
Complete the square: 4x² - 40x - 11
Answer: 4(x - 5)² - 111 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 13cm, angle = 45°. Give your answer to 2 decimal places
Answer: 110.31cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 24:40:15 -
5. Statistics Averages and range
Find the mean, median and range of: 77, 88, 98, 96, 78, 83, 85. Give your answer to 2 decimal places
Answer: Mean = 86.43, Median = 85, Range = 21