Videos and solutions to help Grade 3 students learn how to express whole number fractions on the number line when the unit interval is 1.

Common Core Standards: 3.NF.3a, 3.NF.3b, 3.NF.3c

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Common Core For Grade 3

New York State Common Core Math Module 5, Grade 3, Lesson 25

Lesson 25 Application Problem

Linc drinks 1 eighth gallon of milk every morning.

a. How many days would it take for him to drink 1 gallon of milk?

Use a number line and words to explain your answer.

b. How many days would it take him to drink 2 gallons?

Extend your number line to show 2 gallons and use words to explain your answer.

Lesson 25 Concept Development

Each rectangle represents 1 whole. Partition the first rectangle into thirds.

Write the whole as a fraction below it.

3/3 = 1 whole

Now partition the second rectangle into halves. Label the whole as a fraction below it.

2/2 = 1 whole

Now partition the third rectangle into wholes.

What do you mean? It is already a whole. That means 0 partitions!

1 whole as a fraction is to write it as 1/1

We didn’t split it into more parts, so the whole is still in 1 piece, and we’re counting that 1 piece.

Using a number line, tell the difference between 2/1 and 2/2

2/2 means one whole. 2/1 means 2 wholes.

Lesson 25 Homework

1. Label the following models as a fraction inside the boxes.

2. Fill in missing whole numbers. Then rename the wholes in the boxes.

3. Explain the difference between these fractions using a number line, pictorial model, or words.

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