Keystones — Capstone
Five GCSE retrieval questions · 20 July 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 3√12
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: x² - x - 1
Answer: (x - 1⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 26cm, angle = 80°. Give your answer to 2 decimal places
Answer: 307.26cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 56:72:9 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 25, 82, 32, 51, 10, 92, 66, 58. Give your answer to 2 decimal places
Answer: Mean = 47.33, Median = 51, Range = 82