In the previous post we learnt how to multiply any number from 20 to 29 by 5 in seconds.Today we are going to learn another amazing trick to multiply any number from 30 to 39 by 5 in seconds.
Let us see the steps
Step 1: Assume the base as 30
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 1:32 x 5 = ?
Step 1:We assume the base as 30.
Step 2:Multiplying the base by 5
We get 30 x 5 = 150
Step 3:Multiplying the unit place digit by 5
We get 2 x 5 =10
Step 4:Adding results obtained in step 2 and step 3
We get 150 + 10 = 165
Ans 32 x 5 = 165
Example 2:37 x 5 = ?
Step 1:We assume the base as 30.
Step 2:Multiplying the base by 5
We get 30 x 5 = 150
Step 3:Multiplying the unit place digit by 5
We get 7 x 5 = 35
Step 4:Adding results obtained in step 2 and step 3
We get 150 + 35 = 185
Ans 37 x 5 = 185