Keystones — Capstone
Five GCSE retrieval questions · 24 December 2019 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² + 5.8x
Answer: (x + 2.9)² - 8.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 15cm, angle = 42°
Answer: 150.6cm² -
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: 19, 19, 18, 57, 91, 25, 95
Answer: Mean = 46.3, Median = 25, Range = 77