Let's divide 63970601 by 644
We're looking to find how many times 644 goes into 63970601.

On to step 1:
644 goes into 6 0 times with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
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 / 644

Let's proceed to step 2:
644 goes into 63 0 times with a remainder of 63.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 63, we end up with 63.
Include the next digit (9) from the dividend after 63, then repeat: 639 / 644

Let's proceed to step 3:
639 divided by 644 is 0 with a remainder of 639.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 639 to get 639.
Include the next digit (7) from the dividend after 639, then repeat: 6397 / 644

Let's proceed to step 4:
6397 divided by 644 is 9 with a remainder of 601.
Write down 9 as next digit of the result. 
Result so far: 9.0
Deduct 5796 from 6397 and we're left with 601.
Include the next digit (0) from the dividend after 601, then repeat: 6010 / 644

Step 5:
The number 644 fits into 6010 9 times, leaving a remainder of 214.
Put 9 as the next digit of the answer. 
Result so far: 99.0
Subtracting 5796 from 6010 leaves us with 214.
Append the next digit (6) from the dividend to 214 and continue with: 2146 / 644

Going ahead to step 6:
The number 644 fits into 2146 3 times, leaving a remainder of 214.
Put 3 as the next digit of the answer. 
Result so far: 993.0
If we take 1932 away from 2146, we end up with 214.
Take the next digit (0) from the dividend and append it to 214, then repeat: 2140 / 644

Advancing to step 7:
644 goes into 2140 3 times with a remainder of 208.
The number 3 becomes the next digit in our result. 
Result so far: 9933.0
If we subtract 1932 from 2140, we get 208.
Bring next digit (1) of the dividend behind the 208 and repeat the process: 2081 / 644

On to step 8:
The number 644 fits into 2081 3 times, leaving a remainder of 149.
Use 3 as the next digit of our solution. 
Result so far: 99333.0
If we take 1932 away from 2081, we end up with 149.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1490, and continue the process.

Moving on to step 9:
1490 divided by 644 is 2 with a remainder of 202.
Use 2 as the next digit of our solution. 
Result so far: 99333.2
Subtract 1288 from 1490 to get 202.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2020, and continue the process.

Let's proceed to step 10:
644 goes into 2020 3 times with a remainder of 88.
Record the quotient 3 as the next digit in the result. 
Result so far: 99333.23
Subtract 1932 from 2020 to get 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Going ahead to step 11:
644 goes into 880 1 times with a remainder of 236.
Write down 1 as next digit of the result. 
Result so far: 99333.231
If we take 644 away from 880, we end up with 236.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2360, and continue the process.

Step 12:
644 goes into 2360 3 times with a remainder of 428.
Write down 3 as next digit of the result. 
Result so far: 99333.2313
Deduct 1932 from 2360 and we're left with 428.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4280, and continue the process.

Moving on to step 13:
When dividing 4280 by 644, we get 6 with a remainder of 416.
The next digit of our result is 6. 
Result so far: 99333.23136
If we take 3864 away from 4280, we end up with 416.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4160, and continue the process.

Going ahead to step 14:
The number 644 fits into 4160 6 times, leaving a remainder of 296.
The number 6 becomes the next digit in our result. 
Result so far: 99333.231366
Subtracting 3864 from 4160 leaves us with 296.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2960, and continue the process.

After the division, we end up with 99333.231366 and a remainder of 2.96e-05.