Keystones — Capstone
Five GCSE retrieval questions · 18 October 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√32
Answer: 16√2 -
2. Algebra Completing the square
Complete the square: x² + 9x - 4
Answer: (x + 9⁄2)² - 97⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 24cm, angle = 43°. Give your answer to 2 decimal places
Answer: 139.13cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 27:21:7 -
5. Statistics Averages and range
Find the mean, median and range of: 89, 63, 16, 60, 11, 11, 41. Give your answer to 2 decimal places
Answer: Mean = 41.57, Median = 41, Range = 78