Keystones — Capstone
Five GCSE retrieval questions · 25 February 2012 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√175
Answer: 20√7 -
2. Algebra Completing the square
Complete the square: 4x² - 40x - 5
Answer: 4(x - 5)² - 105 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 16cm, angle = 46°. Give your answer to 2 decimal places
Answer: 155.38cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 32:56:21 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 67, 80, 59, 86, 24, 41
Answer: Mean = 53, Median = 59, Range = 72