74988344 ÷ 646 
The aim is to understand the frequency of 646 in 74988344.

Moving on to step 1:
If we divide 7 by 646, we get 0 and a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Take the next digit (4) from the dividend and append it to 7, then repeat: 74 / 646

Moving on to step 2:
646 can be fit into 74 0 times, resulting in a remainder of 74.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 74 after subtracting 0 from 74.
Include the next digit (9) from the dividend after 74, then repeat: 749 / 646

Advancing to step 3:
646 can be fit into 749 1 times, resulting in a remainder of 103.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 646 from 749 to get 103.
Append the next digit (8) from the dividend to 103 and continue with: 1038 / 646

Let's proceed to step 4:
646 goes into 1038 1 times with a remainder of 392.
The next digit of our result is 1. 
Result so far: 11.0
Deduct 646 from 1038 and we're left with 392.
Append the next digit (8) from the dividend to 392 and continue with: 3928 / 646

Step 5:
3928 divided by 646 is 6 with a remainder of 52.
Use 6 as the next digit of our solution. 
Result so far: 116.0
Subtract 3876 from 3928 to get 52.
Take the next digit (3) from the dividend and append it to 52, then repeat: 523 / 646

Step 6:
If we divide 523 by 646, we get 0 and a remainder of 523.
Record the quotient 0 as the next digit in the result. 
Result so far: 1160.0
Subtracting 0 from 523 leaves us with 523.
Bring next digit (4) of the dividend behind the 523 and repeat the process: 5234 / 646

Moving on to step 7:
When dividing 5234 by 646, we get 8 with a remainder of 66.
Write down 8 as next digit of the result. 
Result so far: 11608.0
If we subtract 5168 from 5234, we get 66.
Bring next digit (4) of the dividend behind the 66 and repeat the process: 664 / 646

Advancing to step 8:
The number 646 fits into 664 1 times, leaving a remainder of 18.
Write down 1 as next digit of the result. 
Result so far: 116081.0
Subtract 646 from 664 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 9:
180 divided by 646 is 0 with a remainder of 180.
Record the quotient 0 as the next digit in the result. 
Result so far: 116081.0
Deduct 0 from 180 and we're left with 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Step 10:
646 can be fit into 1800 2 times, resulting in a remainder of 508.
Write down 2 as next digit of the result. 
Result so far: 116081.02
Subtracting 1292 from 1800 leaves us with 508.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5080, and continue the process.

Step 11:
When dividing 5080 by 646, we get 7 with a remainder of 558.
The number 7 becomes the next digit in our result. 
Result so far: 116081.027
Subtracting 4522 from 5080 leaves us with 558.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5580, and continue the process.

Going ahead to step 12:
5580 divided by 646 is 8 with a remainder of 412.
Record the quotient 8 as the next digit in the result. 
Result so far: 116081.0278
Subtract 5168 from 5580 to get 412.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4120, and continue the process.

On to step 13:
When dividing 4120 by 646, we get 6 with a remainder of 244.
Record the quotient 6 as the next digit in the result. 
Result so far: 116081.02786
If we subtract 3876 from 4120, we get 244.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

On to step 14:
When dividing 2440 by 646, we get 3 with a remainder of 502.
Put 3 as the next digit of the answer. 
Result so far: 116081.027863
If we take 1938 away from 2440, we end up with 502.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5020, and continue the process.

Moving on to step 15:
If we divide 5020 by 646, we get 7 and a remainder of 498.
The next digit of our result is 7. 
Result so far: 116081.0278637
The remainder is 498 after subtracting 4522 from 5020.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4980, and continue the process.

Moving on to step 16:
646 can be fit into 4980 7 times, resulting in a remainder of 458.
The number 7 becomes the next digit in our result. 
Result so far: 116081.02786377
Deduct 4522 from 4980 and we're left with 458.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4580, and continue the process.

The quotient of the division is 116081.02786377, and the remainder is 4.58e-07.