Keystones — Capstone
Five GCSE retrieval questions · 15 May 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 2√80
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: 4x² + 32x + 14
Answer: 4(x + 4)² - 50 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 18cm, angle = 57°. Give your answer to 2 decimal places
Answer: 226.44cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 35:20:28 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 47, 87, 95, 28, 60, 68, 56, 16. Give your answer to 2 decimal places
Answer: Mean = 58.78, Median = 60, Range = 79