 Let's try and learn about the multiplication of two numbers with the same base of course when the supplements have different signs basically. So let's take two numbers like 98 times 104 now how we can perform this multiplication again we first need to identify the base of both numbers and we require that the base is same for both the numbers and then we proceed on writing these two numbers in a vertical fashion and then writing the supplement of it the supplement of 98 is minus 2 since it's 98 minus 100 and the supplement of 104 is plus 4 now how we can perform this multiplication note that 98 and 104 are on the left hand side minus 2 and plus 4 are on the right hand side let's quickly draw the horizontal line and now we are ready to find out the multiplication the result that we are going to get has two parts to it one part is combining the supplement and the other number the other part is the multiplication of the supplements let's first take the combination of a supplement and the opposite number so which is 98 plus 4 or rather 104 and minus 2 in both the cases we will get 102 because the base is 100 with two zeros we will add two zeros after 102 next thing is to multiply minus 2 and plus 4 and the result that we get is minus 8 so basically what we want to do is that we combine the two results and now we have to combine this number and this number here let's do that 102 with two zeros is basically 10,200 plus minus 8 which is basically minus 8 itself and the answer that we get here is 10,192 and so the multiplication of 98 and 104 is 10,192 let's take one more example so let's say we wanted to multiply 991 and 1014 let's quickly identify the base here the base of 991 will be 1000 same thing for 1014 and now we will write these two numbers in a vertical fashion 991,1014 and let's write the supplement for both the supplement for 991 is going to be 991 minus 1000 which is minus 9 let's write minus 9 here and supplement for 1014 is going to be 1014 minus 1000 which is plus 14 let's write plus 14 here we can complete one part of the result which is combining a number and the opposite supplement so 991 plus 14 which is going to be 1005 and then because the base is 1000 we need to pad three zeros in here then for the next step we want to multiply the supplements which are like this so minus 9 times 14 which is going to be minus 126 so let's put a minus sign here and we'll write 126 the final result will be this number minus 126 which is going to be 10,4874 let me quickly write the concluding result 991 times 1014 equals 10,4874 note that we have done subtraction because the signs of the supplements are indifferent