We're dividing 90421287 by 137 
The aim is to understand the frequency of 137 in 90421287.

Going ahead to step 1:
The number 137 fits into 9 0 times, leaving a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 137

Moving on to step 2:
90 divided by 137 is 0 with a remainder of 90.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 90 after subtracting 0 from 90.
Append the next digit (4) from the dividend to 90 and continue with: 904 / 137

Going ahead to step 3:
137 goes into 904 6 times with a remainder of 82.
Put 6 as the next digit of the answer. 
Result so far: 6.0
The remainder is 82 after subtracting 822 from 904.
Take the next digit (2) from the dividend and append it to 82, then repeat: 822 / 137

Going ahead to step 4:
137 can be fit into 822 6 times, resulting in a remainder of 0.
Put 6 as the next digit of the answer. 
Result so far: 66.0
Subtracting 822 from 822 leaves us with 0.
Bring next digit (1) of the dividend behind the 0 and repeat the process: 1 / 137

On to step 5:
If we divide 1 by 137, we get 0 and a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 660.0
The remainder is 1 after subtracting 0 from 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 137

On to step 6:
12 divided by 137 is 0 with a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 6600.0
If we subtract 0 from 12, we get 12.
Fetch the next digit (8) from the dividend, attach it to 12 and continue: 128 / 137

Step 7:
137 goes into 128 0 times with a remainder of 128.
The next digit of our result is 0. 
Result so far: 66000.0
If we subtract 0 from 128, we get 128.
Append the next digit (7) from the dividend to 128 and continue with: 1287 / 137

Let's proceed to step 8:
137 goes into 1287 9 times with a remainder of 54.
Write down 9 as next digit of the result. 
Result so far: 660009.0
The remainder is 54 after subtracting 1233 from 1287.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Advancing to step 9:
When dividing 540 by 137, we get 3 with a remainder of 129.
The next digit of our result is 3. 
Result so far: 660009.3
Deduct 411 from 540 and we're left with 129.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1290, and continue the process.

Going ahead to step 10:
1290 divided by 137 is 9 with a remainder of 57.
The next digit of our result is 9. 
Result so far: 660009.39
Subtract 1233 from 1290 to get 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Moving on to step 11:
137 can be fit into 570 4 times, resulting in a remainder of 22.
The number 4 becomes the next digit in our result. 
Result so far: 660009.394
Subtract 548 from 570 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

On to step 12:
220 divided by 137 is 1 with a remainder of 83.
Write down 1 as next digit of the result. 
Result so far: 660009.3941
Deduct 137 from 220 and we're left with 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Moving on to step 13:
The number 137 fits into 830 6 times, leaving a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 660009.39416
Deduct 822 from 830 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 14:
When dividing 80 by 137, we get 0 with a remainder of 80.
Use 0 as the next digit of our solution. 
Result so far: 660009.39416
The remainder is 80 after subtracting 0 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Going ahead to step 15:
When dividing 800 by 137, we get 5 with a remainder of 115.
Record the quotient 5 as the next digit in the result. 
Result so far: 660009.3941605
Subtract 685 from 800 to get 115.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1150, and continue the process.

Let's proceed to step 16:
137 goes into 1150 8 times with a remainder of 54.
Use 8 as the next digit of our solution. 
Result so far: 660009.39416058
Subtracting 1096 from 1150 leaves us with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

The final outcome is 660009.39416058, with a leftover of 5.4e-08.