Keystones — Capstone
Five GCSE retrieval questions · 3 December 2011 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: x² + 5x
Answer: (x + 5⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 27cm, angle = 67°. Give your answer to 2 decimal places
Answer: 161.55cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 35:40:48 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 12, 90, 29, 20, 59, 25
Answer: Mean = 38, Median = 29, Range = 78