Keystones — Capstone
Five GCSE retrieval questions · 3 February 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 5√125
Answer: 25√5 -
2. Algebra Completing the square
Complete the square: 5x² - 40x - 1
Answer: 5(x - 4)² - 81 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 23cm, angle = 44°. Give your answer to 2 decimal places
Answer: 223.68cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 24:15:5 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 66, 66, 85, 76, 76, 50
Answer: Mean = 65, Median = 66, Range = 49