Keystones — Capstone
Five GCSE retrieval questions · 1 April 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 3√75
Answer: 15√3 -
2. Algebra Completing the square
Complete the square: 2x² - 24x - 3
Answer: 2(x - 6)² - 75 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 18cm, angle = 55°. Give your answer to 2 decimal places
Answer: 191.68cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 4:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 32, 81, 39, 97, 79, 79, 99, 14. Give your answer to 2 decimal places
Answer: Mean = 59.33, Median = 79, Range = 85