Keystones — Capstone
Five GCSE retrieval questions · 1 August 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: 4x² - 16x - 8
Answer: 4(x - 2)² - 24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 15cm, angle = 64°. Give your answer to 2 decimal places
Answer: 128.08cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 10:45:81 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 82, 84, 31, 19, 44, 32, 60, 35. Give your answer to 2 decimal places
Answer: Mean = 46.44, Median = 35, Range = 65