Keystones — Capstone
Five GCSE retrieval questions · 11 December 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√8
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: 5x² - 30x + 10
Answer: 5(x - 3)² - 35 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 16cm, angle = 49°. Give your answer to 2 decimal places
Answer: 181.13cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 4:18:15 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 78, 88, 75, 16, 84, 57
Answer: Mean = 68, Median = 78, Range = 72