We look at the division of 64099723 by 373 
The aim is to understand the frequency of 373 in 64099723.

Going ahead to step 1:
6 divided by 373 is 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 373

Going ahead to step 2:
373 goes into 64 0 times with a remainder of 64.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 64, we get 64.
Fetch the next digit (0) from the dividend, attach it to 64 and continue: 640 / 373

Advancing to step 3:
373 goes into 640 1 times with a remainder of 267.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 267 after subtracting 373 from 640.
Fetch the next digit (9) from the dividend, attach it to 267 and continue: 2679 / 373

Advancing to step 4:
If we divide 2679 by 373, we get 7 and a remainder of 68.
Record the quotient 7 as the next digit in the result. 
Result so far: 17.0
The remainder is 68 after subtracting 2611 from 2679.
Append the next digit (9) from the dividend to 68 and continue with: 689 / 373

Step 5:
373 goes into 689 1 times with a remainder of 316.
The next digit of our result is 1. 
Result so far: 171.0
If we take 373 away from 689, we end up with 316.
Include the next digit (7) from the dividend after 316, then repeat: 3167 / 373

Step 6:
The number 373 fits into 3167 8 times, leaving a remainder of 183.
Record the quotient 8 as the next digit in the result. 
Result so far: 1718.0
Deduct 2984 from 3167 and we're left with 183.
Append the next digit (2) from the dividend to 183 and continue with: 1832 / 373

Step 7:
When dividing 1832 by 373, we get 4 with a remainder of 340.
The number 4 becomes the next digit in our result. 
Result so far: 17184.0
If we subtract 1492 from 1832, we get 340.
Grab the next digit (3) from the dividend, add it to 340, then carry on: 3403 / 373

Step 8:
373 goes into 3403 9 times with a remainder of 46.
Put 9 as the next digit of the answer. 
Result so far: 171849.0
If we subtract 3357 from 3403, we get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

On to step 9:
If we divide 460 by 373, we get 1 and a remainder of 87.
The next digit of our result is 1. 
Result so far: 171849.1
The remainder is 87 after subtracting 373 from 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

On to step 10:
373 can be fit into 870 2 times, resulting in a remainder of 124.
Write down 2 as next digit of the result. 
Result so far: 171849.12
The remainder is 124 after subtracting 746 from 870.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

Advancing to step 11:
373 can be fit into 1240 3 times, resulting in a remainder of 121.
Record the quotient 3 as the next digit in the result. 
Result so far: 171849.123
If we take 1119 away from 1240, we end up with 121.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1210, and continue the process.

Moving on to step 12:
The number 373 fits into 1210 3 times, leaving a remainder of 91.
The number 3 becomes the next digit in our result. 
Result so far: 171849.1233
Subtracting 1119 from 1210 leaves us with 91.
Since there are no more digits in the dividend, we add a zero to the remainder making it 910, and continue the process.

After the division, we end up with 171849.1233 and a remainder of 0.00091.