Keystones — Capstone
Five GCSE retrieval questions · 4 June 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √405
Answer: 9√5 -
2. Algebra Completing the square
Complete the square: 2x² - 4x - 10
Answer: 2(x - 1)² - 12 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 17cm, angle = 69°. Give your answer to 2 decimal places
Answer: 166.64cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 14:18:3 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 63, 57, 26, 46, 15, 79. Give your answer to 2 decimal places
Answer: Mean = 42.29, Median = 46, Range = 69