Keystones — Capstone
Five GCSE retrieval questions · 22 December 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 5√150
Answer: 25√6 -
2. Algebra Completing the square
Complete the square: 3x² + 36x + 8
Answer: 3(x + 6)² - 100 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 16cm, angle = 43°. Give your answer to 2 decimal places
Answer: 92.75cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 2:14:49 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 74, 71, 69, 55, 27, 77, 32. Give your answer to 2 decimal places
Answer: Mean = 57.13, Median = 62, Range = 50