Keystones — Capstone
Five GCSE retrieval questions · 14 May 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √550
Answer: 5√22 -
2. Algebra Completing the square
Complete the square: 4x² + 8x + 3
Answer: 4(x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 18cm, angle = 79°. Give your answer to 2 decimal places
Answer: 194.36cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 12:10:45 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 53, 94, 100, 29, 75, 48
Answer: Mean = 61, Median = 53, Range = 72