77974706 ÷ 213 
The aim is to understand the frequency of 213 in 77974706.

On to step 1:
213 can be fit into 7 0 times, resulting in a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Take the next digit (7) from the dividend and append it to 7, then repeat: 77 / 213

Going ahead to step 2:
213 goes into 77 0 times with a remainder of 77.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 77 after subtracting 0 from 77.
Bring next digit (9) of the dividend behind the 77 and repeat the process: 779 / 213

On to step 3:
When dividing 779 by 213, we get 3 with a remainder of 140.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Deduct 639 from 779 and we're left with 140.
Fetch the next digit (7) from the dividend, attach it to 140 and continue: 1407 / 213

Going ahead to step 4:
1407 divided by 213 is 6 with a remainder of 129.
Write down 6 as next digit of the result. 
Result so far: 36.0
The remainder is 129 after subtracting 1278 from 1407.
Bring next digit (4) of the dividend behind the 129 and repeat the process: 1294 / 213

Step 5:
The number 213 fits into 1294 6 times, leaving a remainder of 16.
Record the quotient 6 as the next digit in the result. 
Result so far: 366.0
Subtract 1278 from 1294 to get 16.
Grab the next digit (7) from the dividend, add it to 16, then carry on: 167 / 213

Let's proceed to step 6:
167 divided by 213 is 0 with a remainder of 167.
Use 0 as the next digit of our solution. 
Result so far: 3660.0
Deduct 0 from 167 and we're left with 167.
Bring next digit (0) of the dividend behind the 167 and repeat the process: 1670 / 213

Moving on to step 7:
1670 divided by 213 is 7 with a remainder of 179.
Write down 7 as next digit of the result. 
Result so far: 36607.0
The remainder is 179 after subtracting 1491 from 1670.
Include the next digit (6) from the dividend after 179, then repeat: 1796 / 213

Moving on to step 8:
When dividing 1796 by 213, we get 8 with a remainder of 92.
Record the quotient 8 as the next digit in the result. 
Result so far: 366078.0
Deduct 1704 from 1796 and we're left with 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

On to step 9:
The number 213 fits into 920 4 times, leaving a remainder of 68.
Use 4 as the next digit of our solution. 
Result so far: 366078.4
Deduct 852 from 920 and we're left with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Moving on to step 10:
213 can be fit into 680 3 times, resulting in a remainder of 41.
Record the quotient 3 as the next digit in the result. 
Result so far: 366078.43
The remainder is 41 after subtracting 639 from 680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Moving on to step 11:
213 goes into 410 1 times with a remainder of 197.
The number 1 becomes the next digit in our result. 
Result so far: 366078.431
If we subtract 213 from 410, we get 197.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1970, and continue the process.

On to step 12:
213 can be fit into 1970 9 times, resulting in a remainder of 53.
The number 9 becomes the next digit in our result. 
Result so far: 366078.4319
Subtracting 1917 from 1970 leaves us with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Advancing to step 13:
If we divide 530 by 213, we get 2 and a remainder of 104.
Record the quotient 2 as the next digit in the result. 
Result so far: 366078.43192
Subtracting 426 from 530 leaves us with 104.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

Step 14:
If we divide 1040 by 213, we get 4 and a remainder of 188.
Record the quotient 4 as the next digit in the result. 
Result so far: 366078.431924
The remainder is 188 after subtracting 852 from 1040.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

Let's proceed to step 15:
The number 213 fits into 1880 8 times, leaving a remainder of 176.
Use 8 as the next digit of our solution. 
Result so far: 366078.4319248
Subtract 1704 from 1880 to get 176.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1760, and continue the process.

Step 16:
213 can be fit into 1760 8 times, resulting in a remainder of 56.
Record the quotient 8 as the next digit in the result. 
Result so far: 366078.43192488
Subtract 1704 from 1760 to get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

The final result is 366078.43192488 with a remainder of 5.6e-08.