Keystones — Capstone
Five GCSE retrieval questions · 14 September 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √686
Answer: 7√14 -
2. Algebra Completing the square
Complete the square: 3x² - 30x + 2
Answer: 3(x - 5)² - 73 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 14cm, angle = 56°. Give your answer to 2 decimal places
Answer: 156.69cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 21:56:24 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 51, 79, 46, 24, 38, 68, 71, 65. Give your answer to 2 decimal places
Answer: Mean = 52.44, Median = 51, Range = 55