The multiplicative inverse is supplied to simplify mathematical expressions. The word 'inverse' indicates somepoint opposite/contrary in result, order, place, or direction. A number that nullifies the affect of a number to identification 1 is called 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 Inverse of a Fraction 5 Multiplicative Inverse of a Mixed Fraction 6 Multiplicative Inverse of Complex Numbers 7 Modular Multiplicative Inverse 8 FAQs on Multiplicative Inverse

## What is Multiplicative Inverse?

The multiplicative inverse of a number is identified as a number which as soon as multiplied by the original number provides the product as 1. The multiplicative inverse of 'a' is denoted by a-1 or 1/a. In other words, once the product of two numbers is 1, they are sassist to be multiplicative inverses of each various other. The multiplicative inverse of a number is characterized as the department of 1 by that number. It is likewise called the reciprocal of the number. The multiplicative inverse property claims that the product of a number and also its multiplicative inverse is 1. For example, let us think about 5 apples. Now, divide the apples right into 5 teams of 1 each. To make them into groups of 1 each, we must divide them by 5. Dividing a number by itself is indistinguishable to multiplying it by its multiplicative inverse . Hence, 5 ÷ 5 = 5 × 1/5 = 1. Here, 1/5 is the multiplicative inverse of 5.

## Multiplicative Inverse of a Natural Number

Natural numbers are counting numbers founding from 1. The multiplicative inverse of a natural number a is 1/a.

Examples

3 is a organic number. If we multiply 3 by 1/3, the product is 1. Thus, the multiplicative inverse of 3 is 1/3.Similarly, the multiplicative inverse of 110 is 1/110.

### Multiplicative Inverse of a Negative Number

Just as for any type of positive number, the product of a negative number and also its reciprocal have to be equal to 1. Hence, the multiplicative inverse of any negative number is its reciprocal. For example, (-6) × (-1/6) = 1, therefore, the multiplicative inverse of -6 is -1/6.

Let us take into consideration a couple of even more examples for a better understanding.

## Multiplicative Inverse of a Unit Fraction

A unit fractivity is a portion with the numerator 1. If we multiply a unit fraction 1/x by x, the product is 1. The multiplicative inverse of a unit fraction 1/x is x.

Examples:

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

## Multiplicative Inverse of a Fraction

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

Examples

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 inverse of 76/43 is 43/76. If we multiply 76/43 by 43/76, the product is 1. (76/43 × 43/76 = 1)

## Multiplicative Inverse of a Mixed Fraction

To discover the multiplicative inverse of a mixed fractivity, transform the combined fractivity into an imappropriate fractivity, then recognize its reciprocal. For example, the multiplicative inverse of (3dfrac12)

Tip 1: Convert (3dfrac12) to an imappropriate fractivity, that is 7/2.Tip 2: Find the reciprocal of 7/2, that is 2/7. Thus, the multiplicative inverse of (3dfrac12) is 2/7.

## Multiplicative Inverse of Complex Numbers

To discover the multiplicative inverse of complex numbers and also genuine numbers is fairly difficult as you are handling rational expressions, through a radical (or) square root in the denominator component of the expression, which provides the fractivity a little bit complicated.

Now, the multiplicative inverse of a complicated number of the form a + (i)b, such as 3+(i)√2, wbelow the 3 is the actual number and (i)√2 is the imaginary number. In order to uncover the reciprocal of this facility number, multiply and also divide it 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. Because of this, 7/3-(i)√2 is the multiplicative inverse of 3+(i)√2

Also, the multiplicative inverse of 3/(√2-1) will certainly be (√2-1)/3. While finding the multiplicative inverse of any type of expression, if tright here is a radical existing in the denominator, the fraction can be rationalized, as shown for a fraction 3/(√2-1) listed below,

Tip 2: Solve. (frac3 sqrt2+12 - 1)Tip 3: Simplify to the lowest create. 3(√2+1)

## Modular Multiplicative Inverse

The modular multiplicative inverse of an integer p is one more integer x such that the product px is congruent to 1 through respect to the modulus m. It have the right to be stood for as: px (equiv ) 1 (mod m). In other words, m divides px - 1 completely. Also, the modular multiplicative inverse of an integer p can exist with respect to the modulus m only if gcd(p, m) = 1

In a nutshell, the multiplicative inverses are as follows:

TypeMultiplicative InverseExample

Natural Number

x

1/xMultiplicative Inverse of 4 is 1/4

Integer

x, x ≠ 0

1/xMultiplicative Inverse of -4 is -1/4

Fraction

x/y; x,y ≠ 0

y/xMultiplicative Inverse of 2/7 is 7/2

Unit Fraction

1/x, x ≠ 0

xMultiplicative Inverse of 1/20 is 20

Tips on Multiplicative Inverse

The multiplicative inverse of a fraction have the right to be acquired by flipping the numerator and denominator.The multiplicative inverse of 1 is 1.The multiplicative inverse of 0 is not characterized.The multiplicative inverse of a number x is composed as 1/x or x-1.The multiplicative inverse of a mixed fraction can be obtained by converting the mixed fractivity right into an improper fractivity and also determining its reciprocal.

Important Notes

The multiplicative inverse of a number is likewise dubbed its reciprocal.The product of a number and also its multiplicative inverse is equal 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 remainder on the table for his 3 friends to share. What is the percent that each of his friends get? Do we apply multiplicative inverse here?

Solution:

Due to the fact that Tom ate 3 slices out of 8, it means he ate 3/8th part of the pizza.

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

5/8 to be mutual among 3 friends ⇒ 5/8 ÷ 3.

We take the multiplicative inverse of the divisor to simplify the division.

5/8 ÷ 3/ 1

= 5/8 × 1/3

= 5/24

Answer: Each of Tom's friends will certainly be getting a 5/24 percent of the left-over pizza.

Example 2: The complete distance from Mark's home to school is 3/4 of a kilometer. He have the right to ride his cycle 1/3 kilometer in a minute. In exactly how many minutes will he reach his school from home?

Solution:

Total distance from house to school = ¾ km

Distance extended in a minute = 1/3 km

The time taken to cover the total distance = full distance/ distance covered

= 3/4 ÷ 1/3

The multiplicative inverse of 1/3 is 3.

3/4 × 3 = 9/4 = 2.25 minutes

Answer: Because of this, the time taken to cover the complete distance by Mark is 2.25 minutes.

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

Solution:

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

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