73470242 divided by 646 
The aim is to understand the frequency of 646 in 73470242.

Step 1:
If we divide 7 by 646, we get 0 and a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Include the next digit (3) from the dividend after 7, then repeat: 73 / 646

Going ahead to step 2:
73 divided by 646 is 0 with a remainder of 73.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 73 and we're left with 73.
Bring next digit (4) of the dividend behind the 73 and repeat the process: 734 / 646

Going ahead to step 3:
If we divide 734 by 646, we get 1 and a remainder of 88.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 646 from 734 and we're left with 88.
Take the next digit (7) from the dividend and append it to 88, then repeat: 887 / 646

Step 4:
When dividing 887 by 646, we get 1 with a remainder of 241.
Put 1 as the next digit of the answer. 
Result so far: 11.0
If we take 646 away from 887, we end up with 241.
Append the next digit (0) from the dividend to 241 and continue with: 2410 / 646

Advancing to step 5:
The number 646 fits into 2410 3 times, leaving a remainder of 472.
The next digit of our result is 3. 
Result so far: 113.0
The remainder is 472 after subtracting 1938 from 2410.
Append the next digit (2) from the dividend to 472 and continue with: 4722 / 646

Going ahead to step 6:
If we divide 4722 by 646, we get 7 and a remainder of 200.
Record the quotient 7 as the next digit in the result. 
Result so far: 1137.0
Subtract 4522 from 4722 to get 200.
Append the next digit (4) from the dividend to 200 and continue with: 2004 / 646

Moving on to step 7:
646 can be fit into 2004 3 times, resulting in a remainder of 66.
Put 3 as the next digit of the answer. 
Result so far: 11373.0
Subtract 1938 from 2004 to get 66.
Include the next digit (2) from the dividend after 66, then repeat: 662 / 646

Step 8:
646 can be fit into 662 1 times, resulting in a remainder of 16.
Put 1 as the next digit of the answer. 
Result so far: 113731.0
If we subtract 646 from 662, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 9:
646 can be fit into 160 0 times, resulting in a remainder of 160.
Use 0 as the next digit of our solution. 
Result so far: 113731.0
If we take 0 away from 160, we end up with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Going ahead to step 10:
1600 divided by 646 is 2 with a remainder of 308.
The number 2 becomes the next digit in our result. 
Result so far: 113731.02
Subtract 1292 from 1600 to get 308.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3080, and continue the process.

Going ahead to step 11:
646 goes into 3080 4 times with a remainder of 496.
Use 4 as the next digit of our solution. 
Result so far: 113731.024
The remainder is 496 after subtracting 2584 from 3080.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4960, and continue the process.

Going ahead to step 12:
The number 646 fits into 4960 7 times, leaving a remainder of 438.
The next digit of our result is 7. 
Result so far: 113731.0247
Deduct 4522 from 4960 and we're left with 438.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4380, and continue the process.

Step 13:
If we divide 4380 by 646, we get 6 and a remainder of 504.
Put 6 as the next digit of the answer. 
Result so far: 113731.02476
Subtract 3876 from 4380 to get 504.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5040, and continue the process.

On to step 14:
If we divide 5040 by 646, we get 7 and a remainder of 518.
The next digit of our result is 7. 
Result so far: 113731.024767
Deduct 4522 from 5040 and we're left with 518.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5180, and continue the process.

Moving on to step 15:
If we divide 5180 by 646, we get 8 and a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 113731.0247678
If we take 5168 away from 5180, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 16:
646 goes into 120 0 times with a remainder of 120.
Put 0 as the next digit of the answer. 
Result so far: 113731.0247678
Subtracting 0 from 120 leaves us with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

The final outcome is 113731.0247678, with a leftover of 1.2e-07.