We divide 74195638 by 644
We want to figure out the number of times 74195638 can be divided by 644.

Advancing to step 1:
When dividing 7 by 644, we get 0 with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Bring next digit (4) of the dividend behind the 7 and repeat the process: 74 / 644

Step 2:
644 goes into 74 0 times with a remainder of 74.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 74, we end up with 74.
Take the next digit (1) from the dividend and append it to 74, then repeat: 741 / 644

On to step 3:
644 can be fit into 741 1 times, resulting in a remainder of 97.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 644 from 741 to get 97.
Take the next digit (9) from the dividend and append it to 97, then repeat: 979 / 644

Moving on to step 4:
The number 644 fits into 979 1 times, leaving a remainder of 335.
Put 1 as the next digit of the answer. 
Result so far: 11.0
Subtract 644 from 979 to get 335.
Bring next digit (5) of the dividend behind the 335 and repeat the process: 3355 / 644

On to step 5:
3355 divided by 644 is 5 with a remainder of 135.
Record the quotient 5 as the next digit in the result. 
Result so far: 115.0
The remainder is 135 after subtracting 3220 from 3355.
Grab the next digit (6) from the dividend, add it to 135, then carry on: 1356 / 644

Let's proceed to step 6:
When dividing 1356 by 644, we get 2 with a remainder of 68.
Record the quotient 2 as the next digit in the result. 
Result so far: 1152.0
If we subtract 1288 from 1356, we get 68.
Take the next digit (3) from the dividend and append it to 68, then repeat: 683 / 644

Moving on to step 7:
644 can be fit into 683 1 times, resulting in a remainder of 39.
The next digit of our result is 1. 
Result so far: 11521.0
The remainder is 39 after subtracting 644 from 683.
Append the next digit (8) from the dividend to 39 and continue with: 398 / 644

Advancing to step 8:
If we divide 398 by 644, we get 0 and a remainder of 398.
Write down 0 as next digit of the result. 
Result so far: 115210.0
Subtract 0 from 398 to get 398.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3980, and continue the process.

Advancing to step 9:
644 can be fit into 3980 6 times, resulting in a remainder of 116.
Put 6 as the next digit of the answer. 
Result so far: 115210.6
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 10:
644 goes into 1160 1 times with a remainder of 516.
Record the quotient 1 as the next digit in the result. 
Result so far: 115210.61
Deduct 644 from 1160 and we're left with 516.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5160, and continue the process.

Advancing to step 11:
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: 115210.618
Deduct 5152 from 5160 and we're left 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.

Advancing to step 12:
644 can be fit into 80 0 times, resulting in a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 115210.618
Deduct 0 from 80 and we're left with 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 13:
When dividing 800 by 644, we get 1 with a remainder of 156.
Write down 1 as next digit of the result. 
Result so far: 115210.61801
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.

Moving on to step 14:
644 goes into 1560 2 times with a remainder of 272.
Use 2 as the next digit of our solution. 
Result so far: 115210.618012
Subtract 1288 from 1560 to get 272.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

Let's proceed to step 15:
If we divide 2720 by 644, we get 4 and a remainder of 144.
Record the quotient 4 as the next digit in the result. 
Result so far: 115210.6180124
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.

Advancing to step 16:
644 goes into 1440 2 times with a remainder of 152.
Put 2 as the next digit of the answer. 
Result so far: 115210.61801242
Subtract 1288 from 1440 to get 152.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1520, and continue the process.

The final result is 115210.61801242 with a remainder of 1.52e-07.