Keystones — Capstone
Five GCSE retrieval questions · 11 June 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: x² + 9x + 2
Answer: (x + 9⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 30cm, angle = 71°. Give your answer to 2 decimal places
Answer: 255.29cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 15:20:36 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 25, 29, 19, 13, 46, 74, 19, 78. Give your answer to 2 decimal places
Answer: Mean = 37.67, Median = 29, Range = 65