Adding and Subtracting Fractions 5.3k/5.3H

Adding and Subtracting Fractions 5.3k

When adding or subtracting fractions, they MUST have the same common denominator. If they have a unlike denominator, than you must make them equivalent with the same denominator.

How to make fraction a common denominator...

Multiple Choice

What is the least common multiple of 4 and 10?

• 2

• 20

• 40

• 100

Multiple Choice

What is the least common denominator of 1/9 and 2/3?

• 6
• 3
• 9
• 21

If I solve correctly, and I do not see my answer?...
-That means our fractions has not been simplified yet!
Simplified fractions- is fractions in their lowest term.

How to make fraction simplified .

Multiple Choice

List all the factors of 12

• 1, 2, 3, 4, 6, 12
• 1, 2, 4, 12
• 1, 12
• 1, 2, 3, 4, 5, 6, 12

Multiple Choice

Simplify the fraction 9/27.

• 1/3

• 4/12

• 2/6

• 3/9

Multiple Choice

Simplify the fraction 10/20.

• 1/2

• 2/4

• 3/5

• 4/8

Multiple Choice

Reduce the fraction 25/35 to its lowest terms.

• 6/8

• 3/5

• 4/7

• 5/7

Adding or subtracting fractions with unlike denominators

• IDENTIFY your denominator

• Find the least common multiple that will go into both denominators. LCM

• Your LCM will not become your LCD- least common denominator.

• Make equivalent with new denominator. "what I do to the top, I do to the bottom."

• solve

• Simplify if needed!

Adding or subtracting fractions with unlike denominators

​IDENTIFY your denominator

• Find the least common multiple that will go into both denominators. LCM

• Your LCM will not become your LCD- least common denominator.

• Make equivalent with new denominator. "what I do to the top, I do to the bottom."

• solve

• Simplify if needed!

Practice....

Multiple Choice

$$\frac{2}{6}+\frac{1}{2}$$  

• 5/6

• 3/6

• 4/6

• 3/8

Multiple Choice

$$\frac{9}{10}-\frac{3}{4}$$  

• 5/7

• 3/20

• 3/8 

• 9/10

Multiple Choice

Jessica rode her bike $$8\ \frac{5}{9}$$   miles last week and $$5\ \frac{1}{3}$$  miles this week. How many miles did Jessica ride last week and this week combined?

• $$13\ \frac{1}{2}$$  

• $$13\ \frac{8}{9}$$  

• $$3\ \frac{2}{9}$$  

• $$12\ \frac{5}{9}$$  

Representing Addition and Subtraction of Fractions 5.3H

STAAR review

Multiple Choice

• F

• G

• H

• J

Multiple Select

choose the fractions that would go in each box

• 1/2

• 1/3

• 1/4

• 1/6

• 2/3

Multiple Choice

• 11/12

• 1

• 10/12

• 1/12

Multiple Choice

• 3/4

• 2/4

• 7/8

• 1/2