Keystones — Capstone
Five GCSE retrieval questions · 16 December 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √605
Answer: 11√5 -
2. Algebra Completing the square
Complete the square: 5x² + 20x + 2
Answer: 5(x + 2)² - 18 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 18cm, angle = 71°. Give your answer to 2 decimal places
Answer: 204.23cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 25:10:6 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 68, 64, 57, 94, 35, 35, 17. Give your answer to 2 decimal places
Answer: Mean = 50.63, Median = 46, Range = 77