Keystones — Capstone
Five GCSE retrieval questions · 21 April 2019 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² + 5.4x
Answer: (x + 2.7)² - 7.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 21cm, angle = 44°
Answer: 153.2cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 4:3. Find a:b:c.
Answer: 6:4:3 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 75, 56, 10, 51, 84, 95
Answer: Mean = 67.1, Median = 75, Range = 89