Keystones — Capstone
Five GCSE retrieval questions · 14 April 2020 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² + 3.8x
Answer: (x + 1.9)² - 3.61 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 22cm, angle = 76°
Answer: 320.2cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 1:2. Find a:b:c.
Answer: 3:4:8 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 89, 56, 79, 55, 82, 64
Answer: Mean = 68.3, Median = 64, Range = 36