Keystones — Capstone
Five GCSE retrieval questions · 4 July 2010 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 3√80
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: x² - 11x + 7
Answer: (x - 11⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 23cm, angle = 44°. Give your answer to 2 decimal places
Answer: 111.84cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 45:72:32 -
5. Statistics Averages and range
Find the mean, median and range of: 44, 94, 33, 18, 53, 64, 59, 84, 18. Give your answer to 2 decimal places
Answer: Mean = 51.89, Median = 53, Range = 76