Let's divide 63973719 by 400
The aim is to understand the frequency of 400 in 63973719.

Advancing to step 1:
6 divided by 400 is 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
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 / 400

On to step 2:
If we divide 63 by 400, we get 0 and a remainder of 63.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 63 leaves us with 63.
Append the next digit (9) from the dividend to 63 and continue with: 639 / 400

Going ahead to step 3:
When dividing 639 by 400, we get 1 with a remainder of 239.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 400 from 639, we get 239.
Include the next digit (7) from the dividend after 239, then repeat: 2397 / 400

Moving on to step 4:
The number 400 fits into 2397 5 times, leaving a remainder of 397.
Use 5 as the next digit of our solution. 
Result so far: 15.0
The remainder is 397 after subtracting 2000 from 2397.
Grab the next digit (3) from the dividend, add it to 397, then carry on: 3973 / 400

Going ahead to step 5:
When dividing 3973 by 400, we get 9 with a remainder of 373.
Record the quotient 9 as the next digit in the result. 
Result so far: 159.0
If we take 3600 away from 3973, we end up with 373.
Append the next digit (7) from the dividend to 373 and continue with: 3737 / 400

On to step 6:
If we divide 3737 by 400, we get 9 and a remainder of 137.
Record the quotient 9 as the next digit in the result. 
Result so far: 1599.0
Subtracting 3600 from 3737 leaves us with 137.
Take the next digit (1) from the dividend and append it to 137, then repeat: 1371 / 400

Advancing to step 7:
When dividing 1371 by 400, we get 3 with a remainder of 171.
The number 3 becomes the next digit in our result. 
Result so far: 15993.0
Subtract 1200 from 1371 to get 171.
Fetch the next digit (9) from the dividend, attach it to 171 and continue: 1719 / 400

Advancing to step 8:
1719 divided by 400 is 4 with a remainder of 119.
The number 4 becomes the next digit in our result. 
Result so far: 159934.0
Deduct 1600 from 1719 and we're left with 119.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

Advancing to step 9:
400 can be fit into 1190 2 times, resulting in a remainder of 390.
The number 2 becomes the next digit in our result. 
Result so far: 159934.2
If we subtract 800 from 1190, we get 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3900, and continue the process.

Step 10:
The number 400 fits into 3900 9 times, leaving a remainder of 300.
Record the quotient 9 as the next digit in the result. 
Result so far: 159934.29
The remainder is 300 after subtracting 3600 from 3900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Advancing to step 11:
When dividing 3000 by 400, we get 7 with a remainder of 200.
The next digit of our result is 7. 
Result so far: 159934.297
Subtracting 2800 from 3000 leaves us with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

On to step 12:
When dividing 2000 by 400, we get 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 159934.2975
If we take 2000 away from 2000, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 13:
The number 400 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 159934.2975
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 14:
0 divided by 400 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 159934.2975
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 159934.2975, and the remainder is 0.0.