Keystones — Capstone
Five GCSE retrieval questions · 25 August 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: x² - 7x - 6
Answer: (x - 7⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 24cm, angle = 67°. Give your answer to 2 decimal places
Answer: 187.78cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 15:40:16 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 18, 36, 13, 48, 27, 40. Give your answer to 2 decimal places
Answer: Mean = 32.57, Median = 36, Range = 35