Keystones — Capstone
Five GCSE retrieval questions · 10 March 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 3√63
Answer: 9√7 -
2. Algebra Completing the square
Complete the square: 5x² - 30x - 9
Answer: 5(x - 3)² - 54 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 17cm, angle = 53°. Give your answer to 2 decimal places
Answer: 135.77cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 42:35:10 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 77, 18, 10, 39, 13, 31, 41
Answer: Mean = 33.5, Median = 35, Range = 67