Let's divide 377211 by 90
The aim is to understand the frequency of 90 in 377211.

Advancing to step 1:
The number 90 fits into 3 0 times, leaving a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Append the next digit (7) from the dividend to 3 and continue with: 37 / 90

Advancing to step 2:
The number 90 fits into 37 0 times, leaving a remainder of 37.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 37 to get 37.
Take the next digit (7) from the dividend and append it to 37, then repeat: 377 / 90

Let's proceed to step 3:
When dividing 377 by 90, we get 4 with a remainder of 17.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtracting 360 from 377 leaves us with 17.
Include the next digit (2) from the dividend after 17, then repeat: 172 / 90

Let's proceed to step 4:
If we divide 172 by 90, we get 1 and a remainder of 82.
Write down 1 as next digit of the result. 
Result so far: 41.0
The remainder is 82 after subtracting 90 from 172.
Grab the next digit (1) from the dividend, add it to 82, then carry on: 821 / 90

Moving on to step 5:
90 goes into 821 9 times with a remainder of 11.
The next digit of our result is 9. 
Result so far: 419.0
Subtracting 810 from 821 leaves us with 11.
Fetch the next digit (1) from the dividend, attach it to 11 and continue: 111 / 90

Moving on to step 6:
90 goes into 111 1 times with a remainder of 21.
The next digit of our result is 1. 
Result so far: 4191.0
The remainder is 21 after subtracting 90 from 111.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Step 7:
The number 90 fits into 210 2 times, leaving a remainder of 30.
Use 2 as the next digit of our solution. 
Result so far: 4191.2
Deduct 180 from 210 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 8:
When dividing 300 by 90, we get 3 with a remainder of 30.
Record the quotient 3 as the next digit in the result. 
Result so far: 4191.23
If we take 270 away from 300, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 9:
The number 90 fits into 300 3 times, leaving a remainder of 30.
Use 3 as the next digit of our solution. 
Result so far: 4191.233
If we take 270 away from 300, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

The final outcome is 4191.233, with a leftover of 0.003.