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Cogito

Grade 3 Math · Chapter 5 · Lesson 2

Practice Worksheet

Unit Fractions

One piece out of the whole.

10 problems · about 12 minutes · 3.NF.A.1

NameDate

Figure — use these to answer the problems

Set both numerators to 1 and change the denominators.
1/4
1/8
011/41/8

1/4 is greater than 1/8.

Left top number1
Left bottom number4
Right top number1
Right bottom number8
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

3 problems

  1. From “Equal Parts of a Whole”

    A shape cut into 5 equal parts. What is the denominator?

    Answer

  2. From “Area of Joined Shapes”

    A 6 by 3 part and a 4 by 2 part. Total area?

    Answer

  3. From “Same Area, Different Shape”

    A 2 by 9 rectangle. What is its area?

    Answer

Warm Up

Straightforward practice. Get the method working first.

3 problems

  1. Which is bigger, 1/4 or 1/6?

    • 1/4
    • 1/6

  2. What does the numerator tell you?

    • How many parts you have.
    • How many parts the whole was cut into.

  3. Which is bigger, 1/3 or 1/5?

    • 1/3
    • 1/5

Build It Up

The same ideas with more to keep track of.

1 problem

  1. Which is bigger, 1/6 or 1/2?

    • 1/2
    • 1/6

Stretch Yourself

Mixed problems. Work out what kind of question it is before you start.

3 problems

  1. How many eighths make one whole?

    Answer

  2. Sharing a Cake

    Would you rather have 1/3 of a cake or 1/6 of the same cake?

    • 1/3.
    • 1/6.

  3. The Smallest Piece

    Which is the smallest: 1/2, 1/5, or 1/8?

    • 1/8.
    • 1/5.
    • 1/2.