Keystones — Capstone
Five GCSE retrieval questions · 9 May 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √1000
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: 5x² + 50x + 12
Answer: 5(x + 5)² - 113 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 19cm, angle = 76°. Give your answer to 2 decimal places
Answer: 276.53cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 8:14:7 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 13, 88, 59, 96, 69, 50. Give your answer to 2 decimal places
Answer: Mean = 56.57, Median = 59, Range = 83