Keystones — Capstone
Five GCSE retrieval questions · 2 July 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: x² - 11x - 1
Answer: (x - 11⁄2)² - 125⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 24cm, angle = 52°. Give your answer to 2 decimal places
Answer: 141.84cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 8:40:25 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 82, 77, 15, 99, 11, 57, 11. Give your answer to 2 decimal places
Answer: Mean = 51.38, Median = 58, Range = 88