Keystones — Capstone
Five GCSE retrieval questions · 10 April 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: 4x² + 8x + 8
Answer: 4(x + 1)² + 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 30cm, angle = 43°. Give your answer to 2 decimal places
Answer: 204.6cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 49:14:2 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 69, 64, 53, 39, 94, 62, 60, 40. Give your answer to 2 decimal places
Answer: Mean = 57.78, Median = 60, Range = 55