Keystones — Capstone
Five GCSE retrieval questions · 13 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √175
Answer: 5√7 -
2. Algebra Completing the square
Complete the square: 2x² - 4x - 5
Answer: 2(x - 1)² - 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 19cm, angle = 57°. Give your answer to 2 decimal places
Answer: 143.41cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 49:42:48 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 45, 87, 28, 23, 87, 42
Answer: Mean = 50, Median = 42, Range = 64