Keystones — Capstone
Five GCSE retrieval questions · 4 March 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√112
Answer: 16√7 -
2. Algebra Completing the square
Complete the square: 3x² - 6x + 9
Answer: 3(x - 1)² + 6 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 27cm, angle = 75°. Give your answer to 2 decimal places
Answer: 326cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 49:35:30 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 48, 69, 22, 48, 71, 72, 54, 73. Give your answer to 2 decimal places
Answer: Mean = 57.44, Median = 60, Range = 51