Keystones — Capstone
Five GCSE retrieval questions · 21 July 2021 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
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 = 30cm, b = 14cm, angle = 51°
Answer: 163.2cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 3:4. Find a:b:c.
Answer: 2:3:4 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 37, 34, 65, 71, 70, 29, 11
Answer: Mean = 41.5, Median = 37, Range = 60