We're dividing 21236152 by 406 
The aim is to understand the frequency of 406 in 21236152.

Let's proceed to step 1:
The number 406 fits into 2 0 times, leaving a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 406

Moving on to step 2:
406 can be fit into 21 0 times, resulting in a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Append the next digit (2) from the dividend to 21 and continue with: 212 / 406

Let's proceed to step 3:
406 goes into 212 0 times with a remainder of 212.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 212 to get 212.
Fetch the next digit (3) from the dividend, attach it to 212 and continue: 2123 / 406

On to step 4:
When dividing 2123 by 406, we get 5 with a remainder of 93.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
Subtract 2030 from 2123 to get 93.
Append the next digit (6) from the dividend to 93 and continue with: 936 / 406

Going ahead to step 5:
936 divided by 406 is 2 with a remainder of 124.
Put 2 as the next digit of the answer. 
Result so far: 52.0
Deduct 812 from 936 and we're left with 124.
Append the next digit (1) from the dividend to 124 and continue with: 1241 / 406

Let's proceed to step 6:
When dividing 1241 by 406, we get 3 with a remainder of 23.
Put 3 as the next digit of the answer. 
Result so far: 523.0
If we take 1218 away from 1241, we end up with 23.
Grab the next digit (5) from the dividend, add it to 23, then carry on: 235 / 406

Step 7:
235 divided by 406 is 0 with a remainder of 235.
Record the quotient 0 as the next digit in the result. 
Result so far: 5230.0
Deduct 0 from 235 and we're left with 235.
Grab the next digit (2) from the dividend, add it to 235, then carry on: 2352 / 406

Advancing to step 8:
406 goes into 2352 5 times with a remainder of 322.
Write down 5 as next digit of the result. 
Result so far: 52305.0
If we take 2030 away from 2352, we end up with 322.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3220, and continue the process.

Advancing to step 9:
406 can be fit into 3220 7 times, resulting in a remainder of 378.
Write down 7 as next digit of the result. 
Result so far: 52305.7
If we subtract 2842 from 3220, we get 378.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3780, and continue the process.

Moving on to step 10:
If we divide 3780 by 406, we get 9 and a remainder of 126.
Write down 9 as next digit of the result. 
Result so far: 52305.79
Deduct 3654 from 3780 and we're left with 126.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1260, and continue the process.

Moving on to step 11:
The number 406 fits into 1260 3 times, leaving a remainder of 42.
The number 3 becomes the next digit in our result. 
Result so far: 52305.793
If we take 1218 away from 1260, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Step 12:
When dividing 420 by 406, we get 1 with a remainder of 14.
Use 1 as the next digit of our solution. 
Result so far: 52305.7931
The remainder is 14 after subtracting 406 from 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 13:
When dividing 140 by 406, we get 0 with a remainder of 140.
Record the quotient 0 as the next digit in the result. 
Result so far: 52305.7931
Subtracting 0 from 140 leaves us with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

On to step 14:
When dividing 1400 by 406, we get 3 with a remainder of 182.
Write down 3 as next digit of the result. 
Result so far: 52305.793103
Subtract 1218 from 1400 to get 182.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1820, and continue the process.

Let's proceed to step 15:
When dividing 1820 by 406, we get 4 with a remainder of 196.
Put 4 as the next digit of the answer. 
Result so far: 52305.7931034
Deduct 1624 from 1820 and we're left with 196.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1960, and continue the process.

Advancing to step 16:
When dividing 1960 by 406, we get 4 with a remainder of 336.
Put 4 as the next digit of the answer. 
Result so far: 52305.79310344
If we take 1624 away from 1960, we end up with 336.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3360, and continue the process.

Our division results in 52305.79310344 with a remaining 3.36e-07.