What is the Least Common Denominator?
The Least Common Denominator (LCD) is the smallest number that two or more denominators can divide into evenly.
When fractions have different denominators, we can't compare or add them directly. That's where LCD comes to the rescue! It helps us rewrite fractions so they all have the same denominator, making math operations much easier.
How to Find the LCD
1️⃣ List the multiples of each denominator
2️⃣ Find the smallest number that appears in all lists
3️⃣ That's your LCD! Now you can rewrite the fractions
Let's Practice Together!
Example 1: Find LCD of 4 and 6
Multiples of 4: 4, 8, 12, 16, 20...
Multiples of 6: 6, 12, 18, 24, 30...
The smallest common number is 12!
Example 2: Interactive Practice
Find the LCD of and
Your answer:
Parent Tips 🌟
- Baking fractions: Use measuring cups to show how 1/2 cup + 1/3 cup needs a common measure (6ths) to add properly.
- LCD scavenger hunt: Have your child find household items that come in different fractions (pizza slices, chocolate bars) and calculate their LCDs.
- Skip counting: Practice multiples by skip counting (e.g., for 4: 4, 8, 12, 16...) to build the foundation for finding LCDs.