Whenever you want to multiply any 2 digit number by 5, this trick is simply amazing to use.We shall learn this trick using an example.
Suppose we want to multiply 16 by 5
Step 1:Assume the closest round number as base
In our example,we can assume 10 as base.
Step 2:Multiply the base by 5.
We get 10 x 5 = 50
Step 3:Now multiply unit place digit by 5
We get 6 x 5 = 30
Step 4:Add result obtained in step 2 and step 3
We get 50 + 30 = 80
Ans 16 x 5 = 80
Lets see another example
Example 2:17 x 5=?
Step 1:Assuming 10 as base
Step 2:Multiplying the base by 5
We get 10 x 5 = 50
Step 3:Multiplying the unit place digit by 5
We get 7 x 5 = 35
Step 4:Adding step 2 and step 3
We get 50 + 35 = 85
Ans 17 x 5 = 85