Keystones — Capstone
Five GCSE retrieval questions · 21 May 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √833
Answer: 7√17 -
2. Algebra Completing the square
Complete the square: 4x² + 40x + 7
Answer: 4(x + 5)² - 93 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 19cm, angle = 61°. Give your answer to 2 decimal places
Answer: 216.03cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 28:20:45 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 57, 65, 22, 72, 31, 35. Give your answer to 2 decimal places
Answer: Mean = 45.43, Median = 36, Range = 50