Keystones — Capstone
Five GCSE retrieval questions · 25 September 2013 · 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: x² + 11x + 8
Answer: (x + 11⁄2)² - 89⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 21cm, angle = 70°. Give your answer to 2 decimal places
Answer: 256.54cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 18:63:35 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 61, 51, 28, 73, 19, 16. Give your answer to 2 decimal places
Answer: Mean = 45.71, Median = 51, Range = 57