Keystones — Capstone
Five GCSE retrieval questions · 10 August 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √432
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: 2x² + 24x - 1
Answer: 2(x + 6)² - 73 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 20cm, angle = 47°. Give your answer to 2 decimal places
Answer: 102.39cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 7:21:18 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 74, 69, 60, 69, 20, 32, 21, 16. Give your answer to 2 decimal places
Answer: Mean = 50.33, Median = 60, Range = 76