Keystones — Capstone
Five GCSE retrieval questions · 26 September 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √1000
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: x² - 9x - 7
Answer: (x - 9⁄2)² - 109⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 23cm, angle = 51°. Give your answer to 2 decimal places
Answer: 223.43cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 14:12:9 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 94, 97, 15, 43, 56, 84. Give your answer to 2 decimal places
Answer: Mean = 58.71, Median = 56, Range = 82