Adding and Subtracting Fractions with Models

Why can't we add fractions with different denominators directly?

• Because the denominators need to be the same for addition

• Because it's easier to visualize

• Because they represent different whole parts

• Because it's mathematically incorrect

Tags

CCSS.3.NF.A.3A

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What is the first step in finding equivalent fractions?

• Adding the numerators

• Drawing rectangular fraction models

• Multiplying the denominators

• Finding the least common multiple

Tags

CCSS.4.NF.A.1

CCSS.5.NF.B.5B

What is the purpose of using rectangular fraction models?

• All of the above

• To find the least common denominator

• To visualize the fractions better

• To make fractions easier to add or subtract

Tags

CCSS.4.NF.A.1

CCSS.5.NF.B.5B

What equivalent fraction does two-thirds become?

• 4/6

• 6/9

• 10/15

• 8/12

Tags

CCSS.3.NF.A.3A

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What is the sum of 10/15 and 3/15?

• 13/15

• 3/5

• 13/30

• 10/18

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

How do you find the equivalent fraction for one-fifth?

• 2/10

• 5/25

• 1/5

• 3/15

Tags

CCSS.3.NF.A.3A

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What is the first step in subtracting fractions using models?

• Multiply the denominators

• Model the fractions on rectangular models

• Find the least common denominator

• Subtract the numerators

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Why do we need to find equivalent fractions before subtracting?

• To make the fractions larger

• To ensure the denominators are the same

• To simplify the fractions

• To use the rectangular models correctly

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What equivalent fraction does three-fourths become?

• 6/8

• 12/16

• 15/20

• 9/12

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What is the result of 9/12 minus 4/12?

• 5/24

• 5/12

• 3/8

• 13/12

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D