15591880 ÷ 749 
The aim is to understand the frequency of 749 in 15591880.

Moving on to step 1:
1 divided by 749 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 749

Moving on to step 2:
749 can be fit into 15 0 times, resulting in a remainder of 15.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 15 and we're left with 15.
Fetch the next digit (5) from the dividend, attach it to 15 and continue: 155 / 749

On to step 3:
155 divided by 749 is 0 with a remainder of 155.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 155 to get 155.
Fetch the next digit (9) from the dividend, attach it to 155 and continue: 1559 / 749

Moving on to step 4:
The number 749 fits into 1559 2 times, leaving a remainder of 61.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 1498 from 1559, we get 61.
Bring next digit (1) of the dividend behind the 61 and repeat the process: 611 / 749

Step 5:
When dividing 611 by 749, we get 0 with a remainder of 611.
Write down 0 as next digit of the result. 
Result so far: 20.0
If we subtract 0 from 611, we get 611.
Fetch the next digit (8) from the dividend, attach it to 611 and continue: 6118 / 749

On to step 6:
749 can be fit into 6118 8 times, resulting in a remainder of 126.
Use 8 as the next digit of our solution. 
Result so far: 208.0
Subtract 5992 from 6118 to get 126.
Append the next digit (8) from the dividend to 126 and continue with: 1268 / 749

Going ahead to step 7:
749 can be fit into 1268 1 times, resulting in a remainder of 519.
Use 1 as the next digit of our solution. 
Result so far: 2081.0
Subtract 749 from 1268 to get 519.
Take the next digit (0) from the dividend and append it to 519, then repeat: 5190 / 749

On to step 8:
5190 divided by 749 is 6 with a remainder of 696.
The next digit of our result is 6. 
Result so far: 20816.0
If we take 4494 away from 5190, we end up with 696.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6960, and continue the process.

Step 9:
6960 divided by 749 is 9 with a remainder of 219.
Use 9 as the next digit of our solution. 
Result so far: 20816.9
The remainder is 219 after subtracting 6741 from 6960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2190, and continue the process.

Moving on to step 10:
The number 749 fits into 2190 2 times, leaving a remainder of 692.
Use 2 as the next digit of our solution. 
Result so far: 20816.92
Subtract 1498 from 2190 to get 692.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6920, and continue the process.

Let's proceed to step 11:
749 can be fit into 6920 9 times, resulting in a remainder of 179.
Use 9 as the next digit of our solution. 
Result so far: 20816.929
Subtracting 6741 from 6920 leaves us with 179.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1790, and continue the process.

Advancing to step 12:
1790 divided by 749 is 2 with a remainder of 292.
The number 2 becomes the next digit in our result. 
Result so far: 20816.9292
Subtract 1498 from 1790 to get 292.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2920, and continue the process.

Going ahead to step 13:
2920 divided by 749 is 3 with a remainder of 673.
The number 3 becomes the next digit in our result. 
Result so far: 20816.92923
If we subtract 2247 from 2920, we get 673.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6730, and continue the process.

Moving on to step 14:
The number 749 fits into 6730 8 times, leaving a remainder of 738.
The number 8 becomes the next digit in our result. 
Result so far: 20816.929238
If we subtract 5992 from 6730, we get 738.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7380, and continue the process.

On to step 15:
749 goes into 7380 9 times with a remainder of 639.
The number 9 becomes the next digit in our result. 
Result so far: 20816.9292389
Subtracting 6741 from 7380 leaves us with 639.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6390, and continue the process.

Going ahead to step 16:
If we divide 6390 by 749, we get 8 and a remainder of 398.
Use 8 as the next digit of our solution. 
Result so far: 20816.92923898
Subtract 5992 from 6390 to get 398.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3980, and continue the process.

After the division, we end up with 20816.92923898 and a remainder of 3.98e-07.