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Cogito

Grade 4 Math · Chapter 5 · Lesson 4

Practice Worksheet

Adding Fractions with the Same Unit

Count the units. The name does not change.

10 problems · about 14 minutes · 4.NF.B.3

NameDate

Figure — use these to answer the problems

Add two fractions of the same unit. Watch the bottom number stay put.
2/5
1/5
3/5

2 fifths plus 1 fifth is 3 fifths, which is written 3/5.

First top number2
First bottom number5
Second top number1
Second bottom number5
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

2 problems

  1. From “Comparing Unlike Fractions”

    2/3 written in twelfths has what top number?

    Answer

  2. From “Equivalent Fractions”

    2/3 = ?/9. What is the top number?

    Answer

Warm Up

Straightforward practice. Get the method working first.

4 problems

  1. 3/10 + 4/10. What is the top number of the answer?

    Answer

  2. Why does the bottom number stay the same?

    • It names what is being counted.
    • Because it is the smaller number.

  3. 2/6 + 3/6. What is the top number of the answer?

    Answer

  4. 2/6 + 3/6. What is the bottom number of the answer?

    Answer

Build It Up

The same ideas with more to keep track of.

2 problems

  1. 7/9 − 4/9. What is the top number of the answer?

    Answer

  2. Does the bottom number change when you add like fractions?

    • No. It names the unit.
    • Yes.

Stretch Yourself

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

2 problems

  1. The Pizza

    Ana eats 2/8 of a pizza and Leo eats 3/8. How much is eaten, in eighths?

    Answereighths

  2. The Juice

    A jug is 6/10 full. Ana drinks 2/10. How many tenths are left?

    Answertenths