Keystones — Capstone
Five GCSE retrieval questions · 27 January 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 5√150
Answer: 25√6 -
2. Algebra Completing the square
Complete the square: 4x² + 24x - 14
Answer: 4(x + 3)² - 50 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 13cm, angle = 48°. Give your answer to 2 decimal places
Answer: 82.12cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 28:12:9 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 97, 45, 18, 63, 95, 57, 66. Give your answer to 2 decimal places
Answer: Mean = 64.88, Median = 64.5, Range = 79