Keystones — Capstone
Five GCSE retrieval questions · 23 September 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√24
Answer: 4√6 -
2. Algebra Completing the square
Complete the square: 5x² - 30x - 15
Answer: 5(x - 3)² - 60 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 29cm, angle = 44°. Give your answer to 2 decimal places
Answer: 221.6cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 12:28:63 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 59, 79, 31, 75, 83, 95, 35
Answer: Mean = 64.25, Median = 67, Range = 64