We look at the division of 21981552 by 415 
The aim is to understand the frequency of 415 in 21981552.

Step 1:
2 divided by 415 is 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 415

Moving on to step 2:
If we divide 21 by 415, we get 0 and a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Grab the next digit (9) from the dividend, add it to 21, then carry on: 219 / 415

On to step 3:
415 goes into 219 0 times with a remainder of 219.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 219, we end up with 219.
Grab the next digit (8) from the dividend, add it to 219, then carry on: 2198 / 415

Moving on to step 4:
When dividing 2198 by 415, we get 5 with a remainder of 123.
Use 5 as the next digit of our solution. 
Result so far: 5.0
If we take 2075 away from 2198, we end up with 123.
Take the next digit (1) from the dividend and append it to 123, then repeat: 1231 / 415

Going ahead to step 5:
415 can be fit into 1231 2 times, resulting in a remainder of 401.
Write down 2 as next digit of the result. 
Result so far: 52.0
Subtract 830 from 1231 to get 401.
Include the next digit (5) from the dividend after 401, then repeat: 4015 / 415

Advancing to step 6:
The number 415 fits into 4015 9 times, leaving a remainder of 280.
Use 9 as the next digit of our solution. 
Result so far: 529.0
Subtract 3735 from 4015 to get 280.
Fetch the next digit (5) from the dividend, attach it to 280 and continue: 2805 / 415

Advancing to step 7:
When dividing 2805 by 415, we get 6 with a remainder of 315.
Record the quotient 6 as the next digit in the result. 
Result so far: 5296.0
Subtracting 2490 from 2805 leaves us with 315.
Bring next digit (2) of the dividend behind the 315 and repeat the process: 3152 / 415

Moving on to step 8:
The number 415 fits into 3152 7 times, leaving a remainder of 247.
Put 7 as the next digit of the answer. 
Result so far: 52967.0
The remainder is 247 after subtracting 2905 from 3152.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2470, and continue the process.

On to step 9:
2470 divided by 415 is 5 with a remainder of 395.
Put 5 as the next digit of the answer. 
Result so far: 52967.5
Deduct 2075 from 2470 and we're left with 395.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3950, and continue the process.

Going ahead to step 10:
If we divide 3950 by 415, we get 9 and a remainder of 215.
Use 9 as the next digit of our solution. 
Result so far: 52967.59
Deduct 3735 from 3950 and we're left with 215.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2150, and continue the process.

Advancing to step 11:
415 goes into 2150 5 times with a remainder of 75.
The number 5 becomes the next digit in our result. 
Result so far: 52967.595
Subtract 2075 from 2150 to get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Advancing to step 12:
750 divided by 415 is 1 with a remainder of 335.
Write down 1 as next digit of the result. 
Result so far: 52967.5951
If we take 415 away from 750, we end up with 335.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3350, and continue the process.

On to step 13:
415 goes into 3350 8 times with a remainder of 30.
Use 8 as the next digit of our solution. 
Result so far: 52967.59518
If we subtract 3320 from 3350, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 14:
The number 415 fits into 300 0 times, leaving a remainder of 300.
Write down 0 as next digit of the result. 
Result so far: 52967.59518
Deduct 0 from 300 and we're left with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

On to step 15:
When dividing 3000 by 415, we get 7 with a remainder of 95.
Write down 7 as next digit of the result. 
Result so far: 52967.5951807
The remainder is 95 after subtracting 2905 from 3000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

Advancing to step 16:
415 goes into 950 2 times with a remainder of 120.
Record the quotient 2 as the next digit in the result. 
Result so far: 52967.59518072
Deduct 830 from 950 and we're left 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.

Our division results in 52967.59518072 with a remaining 1.2e-07.