Keystones — Capstone
Five GCSE retrieval questions · 24 October 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: 3x² + 12x + 11
Answer: 3(x + 2)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 17cm, angle = 77°. Give your answer to 2 decimal places
Answer: 223.62cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 8:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 48, 59, 41, 18, 72, 84. Give your answer to 2 decimal places
Answer: Mean = 51.57, Median = 48, Range = 66