Keystones — Capstone
Five GCSE retrieval questions · 28 March 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√40
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: 2x² - 4x - 7
Answer: 2(x - 1)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 22cm, angle = 48°. Give your answer to 2 decimal places
Answer: 228.89cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 25:40:56 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 16, 23, 97, 11, 78, 38, 74
Answer: Mean = 52, Median = 56, Range = 86