Keystones — Capstone
Five GCSE retrieval questions · 5 February 2018 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √600
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: x² + x + 5
Answer: (x + 1⁄2)² + 19⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 22cm, angle = 46°. Give your answer to 2 decimal places
Answer: 102.87cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 9:18:10 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 89, 74, 61, 69, 17, 45, 83, 24. Give your answer to 2 decimal places
Answer: Mean = 59.33, Median = 69, Range = 72