Keystones — Capstone
Five GCSE retrieval questions · 19 June 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√45
Answer: 15√5 -
2. Algebra Completing the square
Complete the square: 3x² - 24x + 1
Answer: 3(x - 4)² - 47 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 21cm, angle = 57°. Give your answer to 2 decimal places
Answer: 211.34cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 12:15:10 -
5. Statistics Averages and range
Find the mean, median and range of: 88, 75, 74, 13, 91, 89, 39, 79, 70. Give your answer to 2 decimal places
Answer: Mean = 68.67, Median = 75, Range = 78