Keystones — Capstone
Five GCSE retrieval questions · 19 December 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 3√160
Answer: 12√10 -
2. Algebra Completing the square
Complete the square: 5x² + 50x + 2
Answer: 5(x + 5)² - 123 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 18cm, angle = 50°. Give your answer to 2 decimal places
Answer: 137.89cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 3:24:16 -
5. Statistics Averages and range
Find the mean, median and range of: 100, 56, 11, 72, 30, 50, 23, 92
Answer: Mean = 54.25, Median = 53, Range = 89