Multiplication of two numbers ending with 5
Trick to multiply two numbers ending with 5
| Step no | Procedure |
|---|
| 1 | Take the sum of two numbers excluding 5's |
| 2 | if sum is even place last 2 digits as 25 if sum is odd place last 2 digits as 75 |
| 3 | Take the product of two numbers excluding 5's |
| 4 | Add product & sum/2(only integer part)place it before 25 or 75 |
Example: Multiplication of 145 with 165
| Step no | Procedure |
|---|
| 1 | sum=30(14+16)excluding 5's |
| 2 | last 2 digits of product is 25 (sum is even) |
| 3 | product=224(16*14)excluding 5's |
| 4 | 239(224+15) (product+sum/2) 23925((product+sum/2) 25 (sum even)) |
Example: Multiplication of 135 with 145
| Step no | Procedure |
|---|
| 1 | sum=27(13+14)excluding 5's |
| 2 | last 2 digits of product is 75 (sum is odd) |
| 3 | product=182(13*14)excluding 5's |
| 4 | 195(182+13) (product+sum/2(integer part only)) 19575((product+sum/2)75 (sum odd)) |
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