Keystones — Capstone
Five GCSE retrieval questions · 4 June 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: x² - 11x + 1
Answer: (x - 11⁄2)² - 117⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 16cm, angle = 72°. Give your answer to 2 decimal places
Answer: 174.99cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 35:42:48 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 78, 98, 47, 24, 56, 78. Give your answer to 2 decimal places
Answer: Mean = 58.43, Median = 56, Range = 74