Keystones — Capstone
Five GCSE retrieval questions · 11 April 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √405
Answer: 9√5 -
2. Algebra Completing the square
Complete the square: 4x² - 40x + 9
Answer: 4(x - 5)² - 91 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 28cm, angle = 59°. Give your answer to 2 decimal places
Answer: 300.01cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 24:30:5 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 88, 42, 33, 75, 73, 98. Give your answer to 2 decimal places
Answer: Mean = 68.57, Median = 73, Range = 65