Keystones — Capstone
Five GCSE retrieval questions · 22 July 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √80
Answer: 4√5 -
2. Algebra Completing the square
Complete the square: x² - 5x + 9
Answer: (x - 5⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 24cm, angle = 76°. Give your answer to 2 decimal places
Answer: 197.94cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 28:35:20 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 47, 73, 49, 66, 71, 65. Give your answer to 2 decimal places
Answer: Mean = 64.57, Median = 66, Range = 34