Keystones — Capstone
Five GCSE retrieval questions · 14 October 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: x² + 11x + 6
Answer: (x + 11⁄2)² - 97⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 27cm, angle = 51°. Give your answer to 2 decimal places
Answer: 178.35cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 56:24:9 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 22, 78, 60, 63, 46, 20, 44, 30. Give your answer to 2 decimal places
Answer: Mean = 46.22, Median = 46, Range = 58