Keystones — Capstone
Five GCSE retrieval questions · 19 May 2020 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: x² + 4.8x
Answer: (x + 2.4)² - 5.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 30cm, angle = 71°
Answer: 170.2cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 3:5. Find a:b:c.
Answer: 12:6:10 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 27, 29, 68, 84, 81, 65
Answer: Mean = 57.4, Median = 65, Range = 57