G4 7.2 fractions as operators

Fractions as Operators

Poll

Have you ever heard the word operators?

• YES

• NO

Poll

How about Unit Fraction?

• YES

• NO

What we are going to learn today?

1. Describe a unit fraction as a fraction with a numerator of 1

2. Use a unit fraction as an operator, for example, find one-fifth of a quantity by dividing by 5 and find one-sixth of a quantity by dividing by 6.

Operators

Unit Fractions

Multiple Choice

When you use fraction as operator. The fractions will act like ....

• Addition

• Subtraction

• Division

• Multiplication

Multiple Select

Which of the following fractions is NOT an example of unit fractions?

(you can choose more than one answer)

• $$\frac{1}{4}$$

• $$\frac{2}{3}$$

• $$\frac{1}{7}$$

• $$\frac{6}{9}$$

Poll

Now, do you know what does unit fraction and operators mean?

• YES

• NO

Multiple Choice

How much butter needed if I want to make only 8 gingerbread?

• 20 g

• 80 g

• 10 g

• 40 g

How can you find one-third of a quantity?

How can you find one-third of a quantity?

​Divide the number of the ball by 3

How many minutes are in one-third of an hour?

How many minutes are in one-third of an hour?

​20 minutes

Can you answer the questions about fractions as operator now?

Poll

Are you ready?

• YES

• NO

Fill in the Blanks

What is $\frac{1}{3}$ of $12?

Fill in the Blanks

What is one-tenth of 30?

Fill in the Blanks

What is $\frac{1}{5}$ of 45?

Fill in the Blanks

What is one-quarter of 40?

Draw

Complete these diagrams to find fractions of amounts of money.

Poll

Which would you rather have: $$\frac{1}{2}$$ of $15 or $$\frac{1}{4}$$ of $40?

• $$\frac{1}{2}$$ of $15

• $$\frac{1}{4}$$ of $40

Do you have any questions?

Be ready because tomorrow we are going to have some exercises on this topic and please study more at home!

Thank you!