We look at the division of 61539907 by 644 
We want to divide 61539907 by 644.

Let's proceed to step 1:
644 can be fit into 6 0 times, resulting in a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Bring next digit (1) of the dividend behind the 6 and repeat the process: 61 / 644

Going ahead to step 2:
644 goes into 61 0 times with a remainder of 61.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 61 leaves us with 61.
Grab the next digit (5) from the dividend, add it to 61, then carry on: 615 / 644

Advancing to step 3:
644 can be fit into 615 0 times, resulting in a remainder of 615.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 615 leaves us with 615.
Take the next digit (3) from the dividend and append it to 615, then repeat: 6153 / 644

Going ahead to step 4:
644 can be fit into 6153 9 times, resulting in a remainder of 357.
Put 9 as the next digit of the answer. 
Result so far: 9.0
Subtract 5796 from 6153 to get 357.
Take the next digit (9) from the dividend and append it to 357, then repeat: 3579 / 644

Step 5:
644 can be fit into 3579 5 times, resulting in a remainder of 359.
Put 5 as the next digit of the answer. 
Result so far: 95.0
Deduct 3220 from 3579 and we're left with 359.
Grab the next digit (9) from the dividend, add it to 359, then carry on: 3599 / 644

Let's proceed to step 6:
644 goes into 3599 5 times with a remainder of 379.
The next digit of our result is 5. 
Result so far: 955.0
Subtract 3220 from 3599 to get 379.
Bring next digit (0) of the dividend behind the 379 and repeat the process: 3790 / 644

On to step 7:
When dividing 3790 by 644, we get 5 with a remainder of 570.
Record the quotient 5 as the next digit in the result. 
Result so far: 9555.0
Deduct 3220 from 3790 and we're left with 570.
Bring next digit (7) of the dividend behind the 570 and repeat the process: 5707 / 644

On to step 8:
If we divide 5707 by 644, we get 8 and a remainder of 555.
Put 8 as the next digit of the answer. 
Result so far: 95558.0
Subtract 5152 from 5707 to get 555.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5550, and continue the process.

Let's proceed to step 9:
When dividing 5550 by 644, we get 8 with a remainder of 398.
Use 8 as the next digit of our solution. 
Result so far: 95558.8
The remainder is 398 after subtracting 5152 from 5550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3980, and continue the process.

Let's proceed to step 10:
644 can be fit into 3980 6 times, resulting in a remainder of 116.
Write down 6 as next digit of the result. 
Result so far: 95558.86
Deduct 3864 from 3980 and we're left with 116.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

Step 11:
1160 divided by 644 is 1 with a remainder of 516.
The number 1 becomes the next digit in our result. 
Result so far: 95558.861
If we subtract 644 from 1160, we get 516.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5160, and continue the process.

Step 12:
If we divide 5160 by 644, we get 8 and a remainder of 8.
Put 8 as the next digit of the answer. 
Result so far: 95558.8618
Subtracting 5152 from 5160 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 13:
If we divide 80 by 644, we get 0 and a remainder of 80.
Record the quotient 0 as the next digit in the result. 
Result so far: 95558.8618
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.

On to step 14:
The number 644 fits into 800 1 times, leaving a remainder of 156.
Record the quotient 1 as the next digit in the result. 
Result so far: 95558.861801
If we take 644 away from 800, we end up with 156.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1560, and continue the process.

Step 15:
1560 divided by 644 is 2 with a remainder of 272.
Write down 2 as next digit of the result. 
Result so far: 95558.8618012
If we take 1288 away from 1560, we end up with 272.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

Advancing to step 16:
The number 644 fits into 2720 4 times, leaving a remainder of 144.
Record the quotient 4 as the next digit in the result. 
Result so far: 95558.86180124
If we subtract 2576 from 2720, we get 144.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1440, and continue the process.

The final result is 95558.86180124 with a remainder of 1.44e-07.