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## JSS3: MATHEMATICS - 3RD TERM

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Lesson 4, Topic 3
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# Multiplicative Inverse and Identity

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#### Topic Content:

• Multiplicative Inverse and Identity

Multiplicative inverse or (reciprocal) for a number is that number which when multiplied by the number yields the Multiplicative identity 1. Therefore, 1 is the identity for multiplication  e.g.

⇒ $$\scriptsize 5 \: \times \normalsize \frac{1}{5} \scriptsize = 1$$

The multiplicative inverse  of  5 = $$\frac{1}{5}$$

The  multiplicative inverse of $$\frac{1}{5}$$ = 5

### Example 4.3.1:

Find the  reciprocal or multiplicative inverse of the following

a. $$\frac{1}{7}$$

b. $$\: – \frac{1}{5}$$

c. 8

d. $$\frac{4}{5}$$

e. 0.2

f. $$\scriptsize \: -1 \frac{5}{7}$$

g. 2-3

h. $$\frac{1}{10^8}$$

Solution

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