The multiplicative inverse is used to simplify mathematical expressions. Words 'inverse' suggests something opposite/contrary in effect, order, position, or direction. A number the nullifies the influence of a number to identification 1 is referred to as a multiplicative inverse.

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1.What is Multiplicative Inverse?
2.Multiplicative inverse of a natural Number
3.Multiplicative inverse of a Unit Fraction
4.Multiplicative train station of a Fraction
5.Multiplicative station of a mixed Fraction
6.Multiplicative inverse of complicated Numbers
7.Modular Multiplicative Inverse
8.FAQs on Multiplicative Inverse

What is Multiplicative Inverse?

The multiplicative train station of a number is defined as a number which when multiplied through the initial number offers the product as 1. The multiplicative train station of 'a' is denoted by a-1 or 1/a. In various other words, once the product of 2 numbers is 1, castle are stated to it is in multiplicative inverses of every other. The multiplicative station of a number is identified as the division of 1 by that number. The is also called the reciprocal of the number. The multiplicative inverse residential property says the the product the a number and also its multiplicative train station is 1.


For example, let us consider 5 apples. Now, division the to apologize into 5 groups that 1 each. To do them into teams of 1 each, we should divide lock by 5. Splitting a number by chin is tantamount to multiplying it by its multiplicative inverse . Hence, 5 ÷ 5 = 5 × 1/5 = 1. Here, 1/5 is the multiplicative station of 5.

Multiplicative station of a herbal Number

Natural numbers are counting numbers starting from 1. The multiplicative station of a herbal number a is 1/a.


3 is a natural number. If we multiply 3 by 1/3, the product is 1. Therefore, the multiplicative train station of 3 is 1/3.Similarly, the multiplicative inverse of 110 is 1/110.

Multiplicative station of a an unfavorable Number

Just together for any type of positive number, the product that a negative number and its reciprocal have to be same to 1. Thus, the multiplicative station of any an unfavorable number is that is reciprocal. Because that example, (-6) × (-1/6) = 1, therefore, the multiplicative train station of -6 is -1/6.

Let us think about a couple of more examples for a much better understanding.

Multiplicative train station of a Unit Fraction

A unit fraction is a fraction with the numerator 1. If us multiply a unit portion 1/x by x, the product is 1. The multiplicative train station of a unit portion 1/x is x.


The multiplicative inverse of the unit fraction 1/7 is 7. If we multiply 1/7 by 7, the product is 1. (1/7 × 7 = 1)The multiplicative train station of the unit fraction 1/50 is 50. If we multiply 1/50 by 50, the product is 1. (1/50 × 50 = 1)

Multiplicative station of a Fraction

The multiplicative station of a portion a/b is b/a because a/b × b/a = 1 as soon as (a,b ≠ 0)


The multiplicative inverse of 2/7 is 7/2. If we multiply 2/7 by 7/2, the product is 1. (2/7 × 7/2 = 1)The multiplicative station of 76/43 is 43/76. If us multiply 76/43 by 43/76, the product is 1. (76/43 × 43/76 = 1)

Multiplicative train station of a mixed Fraction

To discover the multiplicative train station of a blended fraction, transform the mixed portion into an wrong fraction, then identify its reciprocal. Because that example, the multiplicative train station of (3dfrac12)

Step 1: transform (3dfrac12) come an wrong fraction, the is 7/2.Step 2: discover the reciprocal of 7/2, the is 2/7. Thus, the multiplicative inverse of (3dfrac12) is 2/7.

Multiplicative train station of complicated Numbers

To uncover the multiplicative station of complex numbers and also real numbers is quite challenging as girlfriend are taking care of rational expressions, through a radical (or) square root in the denominator component of the expression, which provides the portion a little bit complex.

Now, the multiplicative station of a facility number of the kind a + (i)b, such as 3+(i)√2, where the 3 is the real number and (i)√2 is the imaginary number. In order to find the reciprocal of this facility number, multiply and divide the by 3-(i)√2, such that: (3+(i)√2)(3-(i)√2/3-(i)√2) = 9 + (i)22/3-(i)√2 = 9 + (-1)2/3-(i)√2 = 9-2/3-(i)√2 = 7/3-(i)√2. Therefore, 7/3-(i)√2 is the multiplicative inverse of 3+(i)√2

Also, the multiplicative inverse of 3/(√2-1) will be (√2-1)/3. While finding the multiplicative inverse of any expression, if there is a radical existing in the denominator, the fraction can be rationalized, as displayed for a portion 3/(√2-1) below,

Step 2: Solve. (frac3 sqrt2+12 - 1)Step 3: leveling to the lowest form. 3(√2+1)

Modular Multiplicative Inverse

The modular multiplicative station of an integer ns is one more integer x such that the product px is congruent to 1 v respect come the modulus m. It deserve to be represented as: px (equiv ) 1 (mod m). In other words, m divides px - 1 completely. Also, the modular multiplicative inverse of an essence p deserve to exist through respect to the modulus m only if gcd(p, m) = 1

In a nutshell, the multiplicative inverses are as follows:

TypeMultiplicative InverseExample

Natural Number


1/xMultiplicative inverse of 4 is 1/4


x, x ≠ 0

1/xMultiplicative train station of -4 is -1/4


x/y; x,y ≠ 0

y/xMultiplicative train station of 2/7 is 7/2

Unit Fraction

1/x, x ≠ 0

xMultiplicative station of 1/20 is 20

Tips ~ above Multiplicative Inverse

The multiplicative station of a portion can be derived by flipping the numerator and denominator.The multiplicative station of 1 is 1.The multiplicative train station of 0 is no defined.The multiplicative train station of a number x is written as 1/x or x-1.The multiplicative inverse of a mixed portion can be acquired by converting the mixed portion into an improper portion and identify its reciprocal.

Important Notes

The multiplicative station of a number is additionally called that reciprocal.The product of a number and its multiplicative inverse is same to 1.

also Check:

Example 1: A pizza is sliced right into 8 pieces. Tom keeps 3 slices of the pizza at the counter and also leaves the rest on the table because that his 3 friends to share. What is the part that each of his girlfriend get? perform we use multiplicative train station here?


Since Tom ate 3 slices the end of 8, it implies he ate 3/8th part of the pizza.

The pizza left out = 1 - 3/8 = 5/8

5/8 to be shared amongst 3 girlfriend ⇒ 5/8 ÷ 3.

We take the multiplicative station of the divisor to leveling the division.

5/8 ÷ 3/ 1

= 5/8 × 1/3

= 5/24

Answer: each of Tom's friends will certainly be obtaining a 5/24 part of the left-over pizza.

Example 2: The full distance from Mark's residence to college is 3/4 of a kilometer. He have the right to ride his cycle 1/3 kilometre in a minute. In how plenty of minutes will he with his school from home?


Total street from house to institution = ¾ km

Distance extended in a minute = 1/3 km

The time required to cover the full distance = total distance/ street covered

= 3/4 ÷ 1/3

The multiplicative inverse of 1/3 is 3.

3/4 × 3 = 9/4 = 2.25 minutes

Answer: Therefore, the time taken to cover the total distance by mark is 2.25 minutes.

Example 3: uncover the multiplicative inverse of -9/10. Also, verify her answer.


The multiplicative inverse of -9/10 is -10/9.

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To verify the answer, we will multiply -9/10 v its multiplicative inverse and also check if the product is 1.