Keystones — Capstone
Five GCSE retrieval questions · 7 July 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 3√275
Answer: 15√11 -
2. Algebra Completing the square
Complete the square: 4x² - 16x - 5
Answer: 4(x - 2)² - 21 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 13cm, angle = 58°. Give your answer to 2 decimal places
Answer: 126.78cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 18:10:35 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 76, 45, 31, 16, 16, 90. Give your answer to 2 decimal places
Answer: Mean = 53.29, Median = 45, Range = 83