Keystones — Capstone
Five GCSE retrieval questions · 29 July 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√63
Answer: 12√7 -
2. Algebra Completing the square
Complete the square: x² - 9x + 7
Answer: (x - 9⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 26cm, angle = 40°. Give your answer to 2 decimal places
Answer: 208.91cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 24:40:5 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 95, 12, 10, 96, 44, 88, 83, 64. Give your answer to 2 decimal places
Answer: Mean = 59.22, Median = 64, Range = 86