Keystones — Capstone
Five GCSE retrieval questions · 12 December 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √32
Answer: 4√2 -
2. Algebra Completing the square
Complete the square: 3x² + 30x + 6
Answer: 3(x + 5)² - 69 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 28cm, angle = 69°. Give your answer to 2 decimal places
Answer: 248.33cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 45:10:16 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 66, 98, 64, 85, 86, 70, 37. Give your answer to 2 decimal places
Answer: Mean = 65.88, Median = 68, Range = 77