Keystones — Capstone
Five GCSE retrieval questions · 1 October 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: 2x² + 12x + 13
Answer: 2(x + 3)² - 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 28cm, angle = 60°. Give your answer to 2 decimal places
Answer: 266.74cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 18:45:40 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 10, 54, 68, 60, 17, 92, 40. Give your answer to 2 decimal places
Answer: Mean = 51.63, Median = 57, Range = 82