Keystones — Capstone
Five GCSE retrieval questions · 30 September 2012 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 3√275
Answer: 15√11 -
2. Algebra Completing the square
Complete the square: 4x² - 40x
Answer: 4(x - 5)² - 100 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 22cm, angle = 51°. Give your answer to 2 decimal places
Answer: 145.33cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 25:40:8 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 57, 40, 68, 60, 91, 46, 52, 84. Give your answer to 2 decimal places
Answer: Mean = 64.67, Median = 60, Range = 51