Keystones — Capstone
Five GCSE retrieval questions · 8 May 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√175
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: 4x² + 8x + 9
Answer: 4(x + 1)² + 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 21cm, angle = 63°. Give your answer to 2 decimal places
Answer: 187.11cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 14:63:54 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 57, 79, 59, 96, 72, 41, 47, 68. Give your answer to 2 decimal places
Answer: Mean = 66.33, Median = 68, Range = 55