Keystones — Capstone
Five GCSE retrieval questions · 12 November 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√45
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: 4x² + 16x - 11
Answer: 4(x + 2)² - 27 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 26cm, angle = 53°. Give your answer to 2 decimal places
Answer: 238.79cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 5:10:2 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 33, 58, 13, 69, 95, 91. Give your answer to 2 decimal places
Answer: Mean = 56.14, Median = 58, Range = 82