Keystones — Capstone
Five GCSE retrieval questions · 19 January 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 2√275
Answer: 10√11 -
2. Algebra Completing the square
Complete the square: 5x² - 40x + 5
Answer: 5(x - 4)² - 75 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 18cm, angle = 49°. Give your answer to 2 decimal places
Answer: 115.47cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 9:12:20 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 62, 77, 48, 50, 77, 85. Give your answer to 2 decimal places
Answer: Mean = 64.14, Median = 62, Range = 37