Keystones — Capstone
Five GCSE retrieval questions · 1 August 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² + 5x + 11
Answer: (x + 5⁄2)² + 19⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 16cm, angle = 75°. Give your answer to 2 decimal places
Answer: 162.28cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 45:72:16 -
5. Statistics Averages and range
Find the mean, median and range of: 42, 21, 41, 75, 68, 94, 30, 39, 39. Give your answer to 2 decimal places
Answer: Mean = 49.89, Median = 41, Range = 73