Multiplication of Fractions

πŸ†Practice multiplication of fractions

How to Multiply Fractions

The multiplication of fractions is carried out by multiplying numerator by numerator and denominator by denominator, this is the method.

  • In case there is any mixed number - We will convert it into a fraction and then solve according to the learned method.
  • In case there is any whole number - We will convert it into a fraction and then solve according to the learned method.
  • The commutative property works - We can change the order of the fractions within the exercise without altering its result.
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Test yourself on multiplication of fractions!

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\( \frac{1}{4}\times\frac{1}{2}= \)

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Multiplying fractions is easy

Multiplying fractions is an impressively easy topic!
In this article, you will learn in no time how to solve any fraction multiplication exercise.
Shall we start?

The method to solve fraction multiplications is - numerator by numerator and denominator by denominator.
Let's remember this method as this is how we will proceed in all the fraction multiplication exercises.

Important observations:

  • The commutative property works - as it is a multiplication exercise, the commutative property acts the same way with fractions, and if we change the order of the parts of the exercise, the result will not be altered.
  • If we come across the multiplication of a fraction by a whole number or by a mixed number, we will first convert that number to a fraction.

Let's start solving and, little by little, we will see all the possibilities along the way.


Multiplication of Fraction by Fraction

Fraction by fraction multiplication exercises are very simple and are solved by multiplying numerator by numerator and denominator by denominator.

For example

23Γ—35=615\frac{2}{3} \times \frac{3}{5}=\frac{6}{15}

Solution:
We multiply the numerator 33 by the numerator 22 and obtained 66 in the numerator.
We multiply the denominator 55 by the denominator 33 and obtained 1515 in the denominator.
We can simplify and arrive at 252 \over 5

Another exercise

12Γ—29Γ—13\frac{1}{2} \times \frac{2}{9} \times \frac{1}{3}
Solution:
We will multiply the numerator by the numerator by the numerator -> 1Γ—2Γ—1=21 \times 2 \times 1=2
and the denominator by the denominator by the denominator 2Γ—9Γ—3=542 \times 9 \times 3=54
We will obtain
2542 \over 54
We can simplify and get to​ 1271 \over 27

Observe - Since this is a multiplication exercise we can apply the commutative property and change the order of the fractions writing them, for example, in the following way - >12Γ—13Γ—29\frac{1}{2}\times \frac{1}{3}\times \frac{2}{9}, the result will not vary.


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Multiplication of an Integer by a Fraction

When we have an exercise with an integer that is multiplied by a fractional number, we will convert the integer to a fraction and then proceed to solve according to the method of numerator by numerator and denominator by denominator.
How do you convert an integer to a fraction? It's very easy!
You can convert any number to a fraction in the following way: write the given number in the numerator
and in the denominator write 11.

For example

2=212=\frac{2}{1}

7=717=\frac{7}{1}

Now let's practice this:
3Γ—26=3 \times \frac{2}{6}=

Solution:
First, let's convert the whole number to a fraction:

13=3\frac{1}{3}=3

Now let's write the exercise only with fractions:
26Γ—31=\frac{2}{6} \times \frac{3}{1}=
Let's solve using the method we learned - Numerator by numerator and denominator by denominator, we will get: 666 \over 6 that is, 11.


Fraction by mixed number

We will solve multiplication exercises of fractions by mixed numbers like this:
We will convert the mixed number to a fraction.
Now we can solve using the method of numerator by numerator and denominator by denominator.
What is a mixed number?
A mixed number is, in fact, a fraction composed of a whole number and a fraction, like, for example 3453 \frac{4}{5}.
How do you convert a mixed number to a fraction?
Multiply the whole number by the denominator.
Then add the numerator, and this will be the number that will be written in the place of the numerator.

For example

Convert the mixed number 4234 \frac{2}{3} to a fraction.
Solution: We will multiply the whole number by the denominator and add the numerator
4Γ—3+2=4 \times 3+2=
12+2=1412+2=14
The obtained number (1414) will be written in the numerator, while the denominator will not change.
This gives us:
423=1434 \frac{2}{3}=\frac{14}{3}
Now let's practice multiplying a mixed number by a fraction:
34Γ—229=\frac{3}{4} \times 2\frac{2}{9}=

Solution:
First, we will convert the mixed number to a fraction:
We will do it the way we learned 2Γ—9+2=202 \times 9+2=20
We will write the result in the numerator and the denominator will remain the same. We obtain: 9209 \over 20
Let's rewrite the exercise:
34Γ—209=\frac{3}{4} \times \frac{20}{9}=

Multiply numerator by numerator and denominator by denominator, we will obtain:
6036=53\frac{60}{36}=\frac{5}{3}


Do you know what the answer is?

Multiplication of an Integer by a Mixed Number

To solve exercises of multiplying an integer by a mixed number, we will convert both numbers to simple fractions, then proceed according to the method of numerator by numerator and denominator by denominator.

Example

5Γ—1235 \times 1\frac{2}{3}
Let's convert the whole number 55 to a fraction -> 515 \over 1
Let's convert the mixed number 12312 \over 3 to a fraction -> 53 5 \over 3
Let's rewrite the exercise and solve by multiplying numerator by numerator and denominator by denominator:
51Γ—53=253\frac{5}{1} \times \frac{5}{3}=\frac{25}{3}


Examples and exercises with solutions for multiplying fractions

Exercise #1

14Γ—12= \frac{1}{4}\times\frac{1}{2}=

Video Solution

Answer

18 \frac{1}{8}

Exercise #2

34Γ—12= \frac{3}{4}\times\frac{1}{2}=

Video Solution

Answer

38 \frac{3}{8}

Exercise #3

16Γ—13= \frac{1}{6}\times\frac{1}{3}=

Video Solution

Answer

118 \frac{1}{18}

Exercise #4

14Γ—32= \frac{1}{4}\times\frac{3}{2}=

Video Solution

Answer

38 \frac{3}{8}

Exercise #5

23Γ—57= \frac{2}{3}\times\frac{5}{7}=

Video Solution

Answer

1021 \frac{10}{21}

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