Keystones — Capstone
Five GCSE retrieval questions · 9 November 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √50
Answer: 5√2 -
2. Algebra Completing the square
Complete the square: 5x² - 10x - 11
Answer: 5(x - 1)² - 16 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 14cm, angle = 58°. Give your answer to 2 decimal places
Answer: 136.54cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 40:45:27 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 78, 43, 70, 45, 35, 68, 84, 48. Give your answer to 2 decimal places
Answer: Mean = 54.56, Median = 48, Range = 64