Keystones — Capstone
Five GCSE retrieval questions · 29 May 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √792
Answer: 6√22 -
2. Algebra Completing the square
Complete the square: x² + 11x - 10
Answer: (x + 11⁄2)² - 161⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 19cm, angle = 68°. Give your answer to 2 decimal places
Answer: 202.59cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 35:56:72 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 18, 45, 98, 23, 93, 51, 66, 35. Give your answer to 2 decimal places
Answer: Mean = 51.78, Median = 45, Range = 80