Keystones — Capstone
Five GCSE retrieval questions · 21 September 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √756
Answer: 6√21 -
2. Algebra Completing the square
Complete the square: 2x² - 4x - 6
Answer: 2(x - 1)² - 8 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 23cm, angle = 57°. Give your answer to 2 decimal places
Answer: 202.54cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 25:30:42 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 79, 31, 88, 10, 64, 19. Give your answer to 2 decimal places
Answer: Mean = 50.71, Median = 64, Range = 78