Multiplication of numbers ending with 5

 Here is one more trick to work on,

Multiplication of numbers ending with 5.

Points to Note in here is that

One must know the Addition, Subtraction, Multiplication, Division  to do this trick

Trick goes like this step wise:

1. We have to multiply the ten's digits
2. We have to add the ten's digits
3. We have to divide the result obtained after adding by 2
4. Main point is that on dividing the result by 2 if we get a result which is in decimals then we have to keep 75 at last of our answer otherwise 25
5. Add that number before the decimal to the multiplication result 
6. write down the answer in the first of our result 
7. We get the answer

                                                              Are the steps clear 

If not check  continue to reading below

Step 1: Identify the Ten's Place digits in this case 1 and 2( as we have taken 15x25=?)

Step 2: Multiply the ten's digits and keep the answer aside (1 x 2=2)

Step 3: Add the Ten's digits and keep the answer aside (1+2=3)

Step 4: Now take out the step 3 result and divide it by 2 (3/2=1.5) which gives us 1.5 here

Step 5: Now observe that we got quotient on dividing in decimal so we have to write 75 as the second part of our answer see below.

Step 6: Now again observe that we got a decimal so the number before he decimal which is 1 in this case has to be added to the step 2 result which is 1 x 2=2 we get 3           (3=1 +2)

Step 7: Now we got the answer by keeping the result from step 6 as a first part of our answer

We got answer 325

so, 15 x 25 =325

For continuous flow of explanation watch the video given below

Hope you got cleared 

Now let's check with bit bigger numbers

let's take 

135 x 35 =?

1.  13 x 3=39

2. 13 + 3=16

3. 16/2 =8     

4. 8 + 39= 47 (our answers first part)  

5. we got non-decimal (Integer) so 25 at last (second part)

6. The answer we obtain is 4725

check out in calculator

and this gif too

Check what you have learnt by clicking the words in inverted 

":Test yourself "

Thank you  :-)

Keep Learning...........,