Keystones — Capstone
Five GCSE retrieval questions · 18 March 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: 3x² + 12x - 8
Answer: 3(x + 2)² - 20 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 30cm, angle = 70°. Give your answer to 2 decimal places
Answer: 310.cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 12:20:45 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 60, 100, 79, 97, 11, 31, 86
Answer: Mean = 63, Median = 69.5, Range = 89