We're dividing 74400570 by 210 
The aim is to understand the frequency of 210 in 74400570.

Step 1:
When dividing 7 by 210, we get 0 with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Take the next digit (4) from the dividend and append it to 7, then repeat: 74 / 210

Step 2:
When dividing 74 by 210, we get 0 with a remainder of 74.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 74 to get 74.
Include the next digit (4) from the dividend after 74, then repeat: 744 / 210

On to step 3:
The number 210 fits into 744 3 times, leaving a remainder of 114.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtract 630 from 744 to get 114.
Grab the next digit (0) from the dividend, add it to 114, then carry on: 1140 / 210

Step 4:
210 can be fit into 1140 5 times, resulting in a remainder of 90.
The number 5 becomes the next digit in our result. 
Result so far: 35.0
Subtracting 1050 from 1140 leaves us with 90.
Append the next digit (0) from the dividend to 90 and continue with: 900 / 210

Step 5:
210 goes into 900 4 times with a remainder of 60.
The next digit of our result is 4. 
Result so far: 354.0
Deduct 840 from 900 and we're left with 60.
Grab the next digit (5) from the dividend, add it to 60, then carry on: 605 / 210

Step 6:
When dividing 605 by 210, we get 2 with a remainder of 185.
The next digit of our result is 2. 
Result so far: 3542.0
Subtract 420 from 605 to get 185.
Fetch the next digit (7) from the dividend, attach it to 185 and continue: 1857 / 210

Let's proceed to step 7:
The number 210 fits into 1857 8 times, leaving a remainder of 177.
The next digit of our result is 8. 
Result so far: 35428.0
Subtract 1680 from 1857 to get 177.
Fetch the next digit (0) from the dividend, attach it to 177 and continue: 1770 / 210

Let's proceed to step 8:
When dividing 1770 by 210, we get 8 with a remainder of 90.
The next digit of our result is 8. 
Result so far: 354288.0
If we subtract 1680 from 1770, we get 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Let's proceed to step 9:
When dividing 900 by 210, we get 4 with a remainder of 60.
Use 4 as the next digit of our solution. 
Result so far: 354288.4
If we subtract 840 from 900, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 10:
210 goes into 600 2 times with a remainder of 180.
The number 2 becomes the next digit in our result. 
Result so far: 354288.42
The remainder is 180 after subtracting 420 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

On to step 11:
The number 210 fits into 1800 8 times, leaving a remainder of 120.
Write down 8 as next digit of the result. 
Result so far: 354288.428
If we take 1680 away from 1800, we end up 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.

Let's proceed to step 12:
If we divide 1200 by 210, we get 5 and a remainder of 150.
The next digit of our result is 5. 
Result so far: 354288.4285
The remainder is 150 after subtracting 1050 from 1200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Step 13:
If we divide 1500 by 210, we get 7 and a remainder of 30.
The number 7 becomes the next digit in our result. 
Result so far: 354288.42857
Deduct 1470 from 1500 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.

Advancing to step 14:
The number 210 fits into 300 1 times, leaving a remainder of 90.
The next digit of our result is 1. 
Result so far: 354288.428571
Subtracting 210 from 300 leaves us with 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Advancing to step 15:
210 can be fit into 900 4 times, resulting in a remainder of 60.
The next digit of our result is 4. 
Result so far: 354288.4285714
If we subtract 840 from 900, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 16:
The number 210 fits into 600 2 times, leaving a remainder of 180.
Write down 2 as next digit of the result. 
Result so far: 354288.42857142
Subtract 420 from 600 to get 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

The quotient of the division is 354288.42857142, and the remainder is 1.8e-07.