Keystones — Capstone
Five GCSE retrieval questions · 28 October 2011 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 5√32
Answer: 20√2 -
2. Algebra Completing the square
Complete the square: 3x² + 36x - 2
Answer: 3(x + 6)² - 110 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 13cm, angle = 73°. Give your answer to 2 decimal places
Answer: 130.54cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 8:36:27 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 22, 68, 14, 78, 18, 83
Answer: Mean = 51, Median = 68, Range = 69