Keystones — Capstone
Five GCSE retrieval questions · 20 October 2020 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² + 5x
Answer: (x + 2.5)² - 6.25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 19cm, angle = 48°
Answer: 120cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 2:5. Find a:b:c.
Answer: 4:2:5 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 66, 41, 78, 34, 77, 79
Answer: Mean = 58.7, Median = 66, Range = 45