Keystones — Capstone
Five GCSE retrieval questions · 19 July 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: x² + 5x + 6
Answer: (x + 5⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 23cm, angle = 43°. Give your answer to 2 decimal places
Answer: 117.64cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 21:35:10 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 69, 77, 19, 92, 33, 12, 23, 33
Answer: Mean = 50, Median = 33, Range = 80