Fractions

Multiples & Least Common Denominators By Rosi Barron <--- To Teacher Page

•Fifth Grade Fractions: Multiples & Least Common Denominators •Tips: -Teachers, please read through the whole presentation prior to the activity.

-Each activity is meant to be used in addition to your classroom teaching.

-Each activity includes a journal component.

•OBJECTIVE: TSW list multiples to utilize fractions with Least Common Denominators.

LCD (Least Common Denominator) is the smallest common multiple of two or more denominators.

EXAMPLE: The LCD for 1 and 5 is 12. 4 6 Follow these steps: Step 1: Find the common multiples of your denominators.

4: 4x1=4 4x2=8 4x3=12 4x4=16 4x5=20 4x6=24 4x7=28 6: 6x1=6 6x2=12 6x3=18 6x4=24 6x5=30 6x6=36 6x7=42 What is the smallest common multiple OR the least common multiple , the LCM?

Click here to find out---->

Is this what you chose?

Step 1: Find the common multiples of your denominators.

4: 4x1=4 4x2=8 4x3=12 4x4=16 4x5=20 4x6=24 4x7=28 6: 6x1=6 6x2=12 6x3=18 6x4=24 6x5=30 6x6=36 6x7=42

YOU ARE CORRECT!

Click here to go to step 2 ------>

Step 2: Use the least common multiple as the least common denominator, or LCD. 1 x = 1 x = 6 x = 12 (LCD) 6 x 2 = 12 (LCD) 3 x = 4 x = 12 (LCD) 3 x = 4 x 3 = 12 (LCD)

Fill in the blanks ----->

1 x 2 = 2 6 x 2 = 12 3 x 3 = 9 4 x 3 = 12 1 6 3 4 = = 2 12 (LCD) 9 12 (LCD) Click here to see what you can do now ----->

Compare:

with LCD 1/6 = OR < OR > 3/4 1/6 = 2/12 and 3/4 = 9/12 2/12 < 9/12

Add:

with LCD 1/6 + 3/4 = ___ 1/6 = 2/12 and 3/4 = 9/12 2/12 + 9/12 =11/12 Journal what you just reviewed ---->