Keystones — Capstone
Five GCSE retrieval questions · 6 September 2010 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 2√112
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: 3x² - 30x - 8
Answer: 3(x - 5)² - 83 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 28cm, angle = 40°. Give your answer to 2 decimal places
Answer: 206.98cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 16:40:15 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 66, 77, 14, 86, 97, 15, 32
Answer: Mean = 52.25, Median = 49, Range = 83