For this instructable we will be using a simple equation 4/5+6/15= x.

Multiples of 5 are 5, 10, 15, 20, 25,...

Multiples of 15 are 15, 30, 45,...

**But wait!**15 is a multiple of both 5 and 15!

**Our LCD is 15**With Instructables you can share what you make with the world, and tap into an ever-growing community of creative experts.

How it Works » New Instructable »
The first step of adding fractions is to find the Lowest Common Denominator (LCD). To find the LCD you must find the multiples of each of your denominators. To find a multiple you take one of you denominators and multiply it by: 1,2,3,4,etc... You then repeat this with the other denominator. The first numeral that is a multiple of both denominators is your LCD.

For this instructable we will be using a simple equation 4/5+6/15= x.

Multiples of 5 are 5, 10, 15, 20, 25,...

Multiples of 15 are 15, 30, 45,...

**But wait!** 15 is a multiple of both 5 and 15!

**Our LCD is 15**

For this instructable we will be using a simple equation 4/5+6/15= x.

Multiples of 5 are 5, 10, 15, 20, 25,...

Multiples of 15 are 15, 30, 45,...

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