Keystones — Capstone
Five GCSE retrieval questions · 9 July 2020 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √242
Answer: 11√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 = 17cm, b = 14cm, angle = 80°
Answer: 117.2cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 3:5. Find a:b:c.
Answer: 4:3:5 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 10, 95, 43, 26, 91, 35
Answer: Mean = 55.7, Median = 43, Range = 85