Chapter 1
Numbers and Operations
Course: Elementary Education Multiple Subjects 5001
Subject: Elementary Education Mathematics Subtest 5003
Chapter: Numbers And Operations
1. Applies the concepts of ratios and unit rates to describe relationships between two quantities
A ratio is a comparison between two quantities. It shows how many times one value is related to another. Ratios can describe part-to-part, part-to-whole, or whole-to-whole relationships. They can be written in different forms:
- As words: 4 to 5
- With a colon: 4:5
- As a fraction: 4/5
Examples:
- If there are 6 red marbles and 3 blue marbles, the ratio of red to blue is 6:3. This can be simplified to 2:1.
- In a class with 10 boys and 15 girls, the ratio of boys to total students is 10:25 or 2:5.
Ratios are not limited to whole numbers. They can also compare decimals, fractions, or measurements like kilometers to hours.