Keystones — Capstone
Five GCSE retrieval questions · 9 December 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: 4x² + 8x + 13
Answer: 4(x + 1)² + 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 30cm, angle = 74°. Give your answer to 2 decimal places
Answer: 216.28cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 56:21:9 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 75, 94, 16, 87, 29, 38. Give your answer to 2 decimal places
Answer: Mean = 58.57, Median = 71, Range = 78