Keystones — Capstone
Five GCSE retrieval questions · 13 January 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√44
Answer: 10√11 -
2. Algebra Completing the square
Complete the square: x² + 5x + 10
Answer: (x + 5⁄2)² + 15⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 22cm, angle = 61°. Give your answer to 2 decimal places
Answer: 202.04cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 24:40:35 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 82, 95, 78, 96, 82, 62. Give your answer to 2 decimal places
Answer: Mean = 73.14, Median = 82, Range = 79