Keystones — Capstone
Five GCSE retrieval questions · 7 September 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: 4x² - 8x + 14
Answer: 4(x - 1)² + 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 25cm, angle = 61°. Give your answer to 2 decimal places
Answer: 174.92cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 32:24:21 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 51, 66, 47, 25, 75, 42. Give your answer to 2 decimal places
Answer: Mean = 53.29, Median = 51, Range = 50