Keystones — Capstone
Five GCSE retrieval questions · 10 October 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √384
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: 2x² + 24x - 1
Answer: 2(x + 6)² - 73 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 18cm, angle = 65°. Give your answer to 2 decimal places
Answer: 220.23cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 15:24:56 -
5. Statistics Averages and range
Find the mean, median and range of: 32, 23, 19, 73, 28, 38, 91, 100, 85. Give your answer to 2 decimal places
Answer: Mean = 54.33, Median = 38, Range = 81