Keystones — Capstone
Five GCSE retrieval questions · 11 December 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√90
Answer: 12√10 -
2. Algebra Completing the square
Complete the square: x² + 3x + 12
Answer: (x + 3⁄2)² + 39⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 18cm, angle = 61°. Give your answer to 2 decimal places
Answer: 228.28cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 5:20:32 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 44, 92, 91, 25, 60, 36, 60. Give your answer to 2 decimal places
Answer: Mean = 58.13, Median = 58.5, Range = 67