Keystones — Capstone
Five GCSE retrieval questions · 10 July 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√12
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: x² + 11x + 8
Answer: (x + 11⁄2)² - 89⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 25cm, angle = 61°. Give your answer to 2 decimal places
Answer: 196.79cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 35:28:32 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 98, 51, 20, 85, 31, 41. Give your answer to 2 decimal places
Answer: Mean = 50.86, Median = 41, Range = 78