61563149 ÷ 123 
We want to figure out the number of times 61563149 can be divided by 123.

On to step 1:
123 goes into 6 0 times with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Include the next digit (1) from the dividend after 6, then repeat: 61 / 123

Step 2:
123 can be fit into 61 0 times, resulting in a remainder of 61.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 61 and we're left with 61.
Take the next digit (5) from the dividend and append it to 61, then repeat: 615 / 123

Going ahead to step 3:
123 goes into 615 5 times with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 5.0
The remainder is 0 after subtracting 615 from 615.
Fetch the next digit (6) from the dividend, attach it to 0 and continue: 6 / 123

Step 4:
If we divide 6 by 123, we get 0 and a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 50.0
If we subtract 0 from 6, we get 6.
Take the next digit (3) from the dividend and append it to 6, then repeat: 63 / 123

Going ahead to step 5:
123 goes into 63 0 times with a remainder of 63.
The number 0 becomes the next digit in our result. 
Result so far: 500.0
If we take 0 away from 63, we end up with 63.
Append the next digit (1) from the dividend to 63 and continue with: 631 / 123

Advancing to step 6:
631 divided by 123 is 5 with a remainder of 16.
Write down 5 as next digit of the result. 
Result so far: 5005.0
Deduct 615 from 631 and we're left with 16.
Fetch the next digit (4) from the dividend, attach it to 16 and continue: 164 / 123

Step 7:
When dividing 164 by 123, we get 1 with a remainder of 41.
The next digit of our result is 1. 
Result so far: 50051.0
If we take 123 away from 164, we end up with 41.
Include the next digit (9) from the dividend after 41, then repeat: 419 / 123

Step 8:
419 divided by 123 is 3 with a remainder of 50.
The number 3 becomes the next digit in our result. 
Result so far: 500513.0
If we subtract 369 from 419, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 9:
If we divide 500 by 123, we get 4 and a remainder of 8.
Use 4 as the next digit of our solution. 
Result so far: 500513.4
If we subtract 492 from 500, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 10:
123 goes into 80 0 times with a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 500513.4
If we subtract 0 from 80, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 11:
If we divide 800 by 123, we get 6 and a remainder of 62.
Write down 6 as next digit of the result. 
Result so far: 500513.406
Deduct 738 from 800 and we're left with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Moving on to step 12:
620 divided by 123 is 5 with a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 500513.4065
Subtracting 615 from 620 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 13:
123 goes into 50 0 times with a remainder of 50.
The number 0 becomes the next digit in our result. 
Result so far: 500513.4065
If we subtract 0 from 50, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 14:
The number 123 fits into 500 4 times, leaving a remainder of 8.
Record the quotient 4 as the next digit in the result. 
Result so far: 500513.406504
The remainder is 8 after subtracting 492 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 15:
123 can be fit into 80 0 times, resulting in a remainder of 80.
Write down 0 as next digit of the result. 
Result so far: 500513.406504
Subtract 0 from 80 to get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

On to step 16:
If we divide 800 by 123, we get 6 and a remainder of 62.
Use 6 as the next digit of our solution. 
Result so far: 500513.40650406
The remainder is 62 after subtracting 738 from 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Our division results in 500513.40650406 with a remaining 6.2e-08.