Lesson 55

How do we make the bottom numbers the same?

• Find the least common multiple

• Or

• Multiply the two bottom numbers together

What are multiples???

• Multiples of 3 = 3, 6, 9, 12...

• Multiples of 4 = 4, 8, 12, 16...

Multiple Choice

What is a common denominator for 1/2 and 2/6?

• 2

• 6

• 10

• 12

Multiple Choice

What is a common denominator for 1/4 and 2/6?

• 4

• 12

• 6

• 16

Multiple Choice

What number could be a common denominator for these two fractions?
2/3   and   3/4

• 3

• 4

• 7

• 12

Finding Common Denominator

You can multiply the numerator and the denominator by the same number.

How do I get my new numerators?

• Whatever you do to the bottom, you must do the same to the top

Multiple Choice

Let's practice. Solve.

$$\frac{1}{2}+\frac{1}{4}$$   Remember, simplify if needed.

• $$\frac{3}{4}$$  

• $$\frac{1}{3}$$  

• $$\frac{2}{6}$$  

Multiple Choice

Solve. Simplify, if needed.

$$\frac{1}{3}+\frac{1}{4}$$  

• $$\frac{2}{12}$$  

• $$\frac{1}{6}$$  

• $$\frac{7}{12}$$  

Multiple Choice

What is the sum of these fractions? 3/4 + 1/5

• 19/20

• 4/4

• 4/5

• 4/20

Multiple Choice

What is the sum of these fractions? 1/4 + 2/3

• 3/4

• 3/3

• 11/12

• 3/12

Multiple Choice

Which fraction renames 3/4 with a denominator of 12?

• 3/12

• 4/12

• 12/12

• 9/12

Multiple Choice

What is the sum of these fractions? 1/4 + 2/3

• 3/4

• 3/3

• 11/12

• 3/12

Open Ended

Solve...

1/4 + 2/3

Open Ended

Solve...

3/5 + 2/3

Assignment

Page 287

A - F on sheet of paper, bring it back Monday