Keystones — Capstone
Five GCSE retrieval questions · 25 January 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √245
Answer: 7√5 -
2. Algebra Completing the square
Complete the square: x² + 3x - 10
Answer: (x + 3⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 28cm, angle = 45°. Give your answer to 2 decimal places
Answer: 158.39cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 14:10:25 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 24, 74, 71, 81, 31, 37, 16. Give your answer to 2 decimal places
Answer: Mean = 47.38, Median = 41, Range = 65