Keystones — Capstone
Five GCSE retrieval questions · 2 September 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √600
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: 5x² + 60x - 8
Answer: 5(x + 6)² - 188 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 24cm, angle = 58°. Give your answer to 2 decimal places
Answer: 162.83cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 12:15:25 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 15, 59, 23, 31, 44, 13. Give your answer to 2 decimal places
Answer: Mean = 40.57, Median = 31, Range = 86