Keystones — Capstone
Five GCSE retrieval questions · 30 July 2020 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² + 5.2x
Answer: (x + 2.6)² - 6.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 18cm, angle = 47°
Answer: 92.2cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 2:5. Find a:b:c.
Answer: 2:4:10 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 58, 86, 36, 14, 78, 100
Answer: Mean = 58.4, Median = 58, Range = 86