Keystones — Capstone
Five GCSE retrieval questions · 27 October 2018 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
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 = 17cm, b = 21cm, angle = 73°
Answer: 170.7cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 2:3. Find a:b:c.
Answer: 2:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 39, 22, 81, 31, 39, 49, 29, 63
Answer: Mean = 43.7, Median = 39, Range = 59