Keystones — Capstone
Five GCSE retrieval questions · 17 September 2018 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: x² + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 17cm, angle = 74°
Answer: 114.4cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:5. Find a:b:c.
Answer: 4:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 40, 51, 45, 47, 94, 21, 46, 52
Answer: Mean = 47, Median = 46, Range = 73