Keystones — Capstone
Five GCSE retrieval questions · 18 January 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √686
Answer: 7√14 -
2. Algebra Completing the square
Complete the square: 5x² + 20x + 3
Answer: 5(x + 2)² - 17 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 28cm, angle = 74°. Give your answer to 2 decimal places
Answer: 161.49cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 8:36:9 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 15, 65, 47, 26, 21, 50. Give your answer to 2 decimal places
Answer: Mean = 41.71, Median = 47, Range = 53