121635 ÷ 79 
We want to divide 121635 by 79.

Step 1:
79 goes into 1 0 times with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 79

Let's proceed to step 2:
12 divided by 79 is 0 with a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 12 leaves us with 12.
Include the next digit (1) from the dividend after 12, then repeat: 121 / 79

Going ahead to step 3:
The number 79 fits into 121 1 times, leaving a remainder of 42.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 42 after subtracting 79 from 121.
Bring next digit (6) of the dividend behind the 42 and repeat the process: 426 / 79

On to step 4:
79 goes into 426 5 times with a remainder of 31.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
Subtract 395 from 426 to get 31.
Append the next digit (3) from the dividend to 31 and continue with: 313 / 79

Going ahead to step 5:
79 can be fit into 313 3 times, resulting in a remainder of 76.
Record the quotient 3 as the next digit in the result. 
Result so far: 153.0
Deduct 237 from 313 and we're left with 76.
Bring next digit (5) of the dividend behind the 76 and repeat the process: 765 / 79

Let's proceed to step 6:
79 can be fit into 765 9 times, resulting in a remainder of 54.
Write down 9 as next digit of the result. 
Result so far: 1539.0
Deduct 711 from 765 and we're left with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

On to step 7:
The number 79 fits into 540 6 times, leaving a remainder of 66.
Put 6 as the next digit of the answer. 
Result so far: 1539.6
The remainder is 66 after subtracting 474 from 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Advancing to step 8:
660 divided by 79 is 8 with a remainder of 28.
Record the quotient 8 as the next digit in the result. 
Result so far: 1539.68
Subtracting 632 from 660 leaves us with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Let's proceed to step 9:
When dividing 280 by 79, we get 3 with a remainder of 43.
Put 3 as the next digit of the answer. 
Result so far: 1539.683
Deduct 237 from 280 and we're left with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Moving on to step 10:
79 can be fit into 430 5 times, resulting in a remainder of 35.
The next digit of our result is 5. 
Result so far: 1539.6835
The remainder is 35 after subtracting 395 from 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Advancing to step 11:
When dividing 350 by 79, we get 4 with a remainder of 34.
Put 4 as the next digit of the answer. 
Result so far: 1539.68354
If we take 316 away from 350, we end up with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Advancing to step 12:
The number 79 fits into 340 4 times, leaving a remainder of 24.
Record the quotient 4 as the next digit in the result. 
Result so far: 1539.683544
The remainder is 24 after subtracting 316 from 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

The quotient of the division is 1539.683544, and the remainder is 2.4e-06.