Keystones — Capstone
Five GCSE retrieval questions · 17 September 2021 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² + 4.6x
Answer: (x + 2.3)² - 5.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 28cm, angle = 57°
Answer: 234.8cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 1:2. Find a:b:c.
Answer: 9:6:12 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 23, 42, 81, 87, 63, 56, 85, 36
Answer: Mean = 54, Median = 56, Range = 74