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Math · Grade 5 Math

Chapter 2: Multiplying and Dividing Whole Numbers

A Fraction Is a Division

The leftover has a name after all.

Lesson
3
Time
About 16 minutes
0 of 8 done

Step 1: Let's Learn

Read it, or press Listen and follow the words.

Sharing 3 cakes among 4 children used to be "0 each, remainder 3". That is not much help.

Share the leftover too

Cut each cake into 4. Every child gets 3 of the quarters, which is 3/4 of a cake.

So a fraction is a division

3 ÷ 4 = 3/4. The top number is what is shared, and the bottom is how many share it.

A rule that breaks

You can divide a smaller number by a bigger one. The answer is simply less than 1.

The fraction bar is a division sign

3/4 means 3 ÷ 4. Share 3 pizzas between 4 people and each gets three quarters. This is not a new fact about fractions — it is what a fraction has meant all along, now stated explicitly.

The remainder finally has a name

17 ÷ 5 = 3 remainder 2 in Grade 4. Now you can say the answer exactly: 3 2/5. The leftover 2 is 2 of the 5 pieces each whole was going to be cut into. Remainders were never an incomplete answer; you just lacked the notation.

Three ways to express one division

17 ÷ 5 can be 3 r 2, or 3 2/5, or 3.4. All three are correct and each suits a different context: buses need the remainder handled separately, recipes want the fraction, money wants the decimal. Choosing the right form is part of answering well.

Reading improper fractions as divisions

17/5 is 17 ÷ 5, which is why converting it to a mixed number is a division: 17 ÷ 5 = 3 remainder 2, giving 3 2/5. The conversion rule you learned by procedure in Grade 4 turns out to be nothing but a division.

Step 2: Try It Yourself

Tap and try it out.

The answer to a division can sit between two whole numbers.
3/4
1/1
013/41/1

3/4 is less than 1/1.

Compare how much of the whole each one covers.

Step 3: Watch an Example

One step at a time.

Watch Leo Share 5 Pizzas Among 4

Leo shares 5 pizzas equally among 4 people.

  1. Step 1

    He gives each person one whole pizza, using 4.

Step 4: Your Turn

Practice makes it stick.

The Ribbon

Problem 1 of 2

7 metres of ribbon shared among 8 people. What is the top number of the fraction each gets?

The Cakes

Problem 2 of 2

9 cakes shared among 4. How many whole cakes does each get?

whole cakes

Division as a Fraction

1 of 4

2 ÷ 5 as a fraction. What is the top number?

2 of 4

2 ÷ 5 as a fraction. What is the bottom number?

3 of 4

11 ÷ 3. How many whole ones?

4 of 4

Can you divide 4 by 6?

Step 5: Quick Check

Show what you know.

Question 1 of 2

5 ÷ 8 as a fraction. What is the top number?

Question 2 of 2

Must the number being divided be the bigger one?

What You Learned

  • a ÷ b can be written a/b.
  • The leftover is shared out too, instead of being left over.
  • Dividing a smaller number by a bigger one gives an answer under 1.