Keystones — Capstone
Five GCSE retrieval questions · 6 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√75
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: 4x² - 24x + 1
Answer: 4(x - 3)² - 35 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 21cm, angle = 65°. Give your answer to 2 decimal places
Answer: 171.29cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 20:12:27 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 58, 38, 82, 80, 45, 70. Give your answer to 2 decimal places
Answer: Mean = 67.43, Median = 70, Range = 61