Keystones — Capstone
Five GCSE retrieval questions · 13 May 2021 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: x² + 4.2x
Answer: (x + 2.1)² - 4.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 25cm, angle = 51°
Answer: 262.3cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 3:5. Find a:b:c.
Answer: 9:12:20 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 50, 98, 93, 49, 57, 33, 71, 39
Answer: Mean = 65.2, Median = 57, Range = 65