Keystones — Capstone
Five GCSE retrieval questions · 4 September 2019 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² + 3x
Answer: (x + 1.5)² - 2.25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 24cm, angle = 53°
Answer: 239.6cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:3. Find a:b:c.
Answer: 8:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 15, 54, 98, 63, 14, 26, 15, 32
Answer: Mean = 43.3, Median = 32, Range = 84