74777438 ÷ 891 
The aim is to understand the frequency of 891 in 74777438.

Step 1:
If we divide 7 by 891, we get 0 and a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Include the next digit (4) from the dividend after 7, then repeat: 74 / 891

On to step 2:
When dividing 74 by 891, we get 0 with a remainder of 74.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 74, we end up with 74.
Bring next digit (7) of the dividend behind the 74 and repeat the process: 747 / 891

On to step 3:
891 can be fit into 747 0 times, resulting in a remainder of 747.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 747 after subtracting 0 from 747.
Fetch the next digit (7) from the dividend, attach it to 747 and continue: 7477 / 891

On to step 4:
When dividing 7477 by 891, we get 8 with a remainder of 349.
The next digit of our result is 8. 
Result so far: 8.0
Subtracting 7128 from 7477 leaves us with 349.
Include the next digit (7) from the dividend after 349, then repeat: 3497 / 891

Moving on to step 5:
When dividing 3497 by 891, we get 3 with a remainder of 824.
The next digit of our result is 3. 
Result so far: 83.0
Deduct 2673 from 3497 and we're left with 824.
Take the next digit (4) from the dividend and append it to 824, then repeat: 8244 / 891

Advancing to step 6:
When dividing 8244 by 891, we get 9 with a remainder of 225.
Put 9 as the next digit of the answer. 
Result so far: 839.0
Deduct 8019 from 8244 and we're left with 225.
Grab the next digit (3) from the dividend, add it to 225, then carry on: 2253 / 891

Going ahead to step 7:
2253 divided by 891 is 2 with a remainder of 471.
The number 2 becomes the next digit in our result. 
Result so far: 8392.0
If we take 1782 away from 2253, we end up with 471.
Append the next digit (8) from the dividend to 471 and continue with: 4718 / 891

Advancing to step 8:
If we divide 4718 by 891, we get 5 and a remainder of 263.
Use 5 as the next digit of our solution. 
Result so far: 83925.0
If we subtract 4455 from 4718, we get 263.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2630, and continue the process.

Advancing to step 9:
891 goes into 2630 2 times with a remainder of 848.
Record the quotient 2 as the next digit in the result. 
Result so far: 83925.2
The remainder is 848 after subtracting 1782 from 2630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8480, and continue the process.

Moving on to step 10:
8480 divided by 891 is 9 with a remainder of 461.
Use 9 as the next digit of our solution. 
Result so far: 83925.29
Subtract 8019 from 8480 to get 461.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4610, and continue the process.

Advancing to step 11:
If we divide 4610 by 891, we get 5 and a remainder of 155.
Write down 5 as next digit of the result. 
Result so far: 83925.295
If we take 4455 away from 4610, we end up with 155.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1550, and continue the process.

On to step 12:
When dividing 1550 by 891, we get 1 with a remainder of 659.
Use 1 as the next digit of our solution. 
Result so far: 83925.2951
Subtract 891 from 1550 to get 659.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6590, and continue the process.

Let's proceed to step 13:
6590 divided by 891 is 7 with a remainder of 353.
Use 7 as the next digit of our solution. 
Result so far: 83925.29517
If we subtract 6237 from 6590, we get 353.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3530, and continue the process.

Moving on to step 14:
When dividing 3530 by 891, we get 3 with a remainder of 857.
Use 3 as the next digit of our solution. 
Result so far: 83925.295173
If we take 2673 away from 3530, we end up with 857.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8570, and continue the process.

Step 15:
8570 divided by 891 is 9 with a remainder of 551.
The next digit of our result is 9. 
Result so far: 83925.2951739
The remainder is 551 after subtracting 8019 from 8570.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5510, and continue the process.

Going ahead to step 16:
The number 891 fits into 5510 6 times, leaving a remainder of 164.
Record the quotient 6 as the next digit in the result. 
Result so far: 83925.29517396
Subtract 5346 from 5510 to get 164.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1640, and continue the process.

The quotient of the division is 83925.29517396, and the remainder is 1.64e-07.