Keystones — Capstone
Five GCSE retrieval questions · 13 October 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 3√175
Answer: 15√7 -
2. Algebra Completing the square
Complete the square: x² + 7x + 11
Answer: (x + 7⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 13cm, angle = 43°. Give your answer to 2 decimal places
Answer: 84.23cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 10:35:14 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 85, 94, 74, 39, 66, 77, 98, 30. Give your answer to 2 decimal places
Answer: Mean = 64.56, Median = 74, Range = 80