Shortcut to multiply any number from 90-99 by 5

Shortcut to multiply any number from 90-99 by 5
Shortcut to multiply any number from 90-99 by 5 in seconds

In the previous post we learnt how to multiply any number from 80 to 89 by 5 in seconds.Today we are going to learn another cool trick to multiply any number from 90 to 99 by 5 in seconds.

Let us see the steps 

Step 1: Assume the base as 90

Step 2: Multiply the base by 5

Step 3:Multiply the unit place digit by 5

Step 4:Add the results obtained in step 2 and step 3 to get 
            final answer.


 
Now lets consider a few examples to understand better

Example 1:93 x 5 = ?

Step 1:We assume the base as 90.

Step 2:Multiplying the base by 5 
          We get 90 x 5 = 450

Step 3:Multiplying the unit place digit by 5
          We get 3 x 5 =15

Step 4:Adding results obtained in step 2 and step 3 
           We get 450 + 15 = 465

Ans 93 x 5 =465


Example 2:98 x 5 = ?

Step 1:We assume the base as 90.

Step 2:Multiplying the base by 5 
          We get 90 x 5 = 450

Step 3:Multiplying the unit place digit by 5
          We get 8 x 5 = 40

Step 4:Adding results obtained in step 2 and step 3 
           We get 450 + 40 = 490

Ans 98 x 5 =490

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