Keystones — Capstone
Five GCSE retrieval questions · 17 January 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √525
Answer: 5√21 -
2. Algebra Completing the square
Complete the square: 3x² + 18x + 11
Answer: 3(x + 3)² - 16 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 13cm, angle = 55°. Give your answer to 2 decimal places
Answer: 79.87cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 35:45:27 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 70, 68, 100, 90, 32, 50. Give your answer to 2 decimal places
Answer: Mean = 72.57, Median = 70, Range = 68