Today we are going to learn another cool trick to multiply any number from 80 to 89 by 5 in seconds.
Let us see the steps
Step 1: Assume the base as 80
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 1:82 x 5 = ?
Step 1:We assume the base as 80.
Step 2:Multiplying the base by 5
We get 80 x 5 = 400
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 400 + 10 = 410
Ans 82 x 5 =410
Example 2:87 x 5 = ?
Step 1:We assume the base as 80.
Step 2:Multiplying the base by 5
We get 80 x 5 = 400
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 400 + 35 = 435
Ans 87 x 5 =435
