Let's divide 86424539 by 210
The aim is to understand the frequency of 210 in 86424539.

Step 1:
If we divide 8 by 210, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 210

Moving on to step 2:
When dividing 86 by 210, we get 0 with a remainder of 86.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 86 to get 86.
Take the next digit (4) from the dividend and append it to 86, then repeat: 864 / 210

Advancing to step 3:
210 goes into 864 4 times with a remainder of 24.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtracting 840 from 864 leaves us with 24.
Fetch the next digit (2) from the dividend, attach it to 24 and continue: 242 / 210

Going ahead to step 4:
If we divide 242 by 210, we get 1 and a remainder of 32.
Use 1 as the next digit of our solution. 
Result so far: 41.0
If we take 210 away from 242, we end up with 32.
Grab the next digit (4) from the dividend, add it to 32, then carry on: 324 / 210

Step 5:
If we divide 324 by 210, we get 1 and a remainder of 114.
Record the quotient 1 as the next digit in the result. 
Result so far: 411.0
The remainder is 114 after subtracting 210 from 324.
Append the next digit (5) from the dividend to 114 and continue with: 1145 / 210

Moving on to step 6:
1145 divided by 210 is 5 with a remainder of 95.
The next digit of our result is 5. 
Result so far: 4115.0
Deduct 1050 from 1145 and we're left with 95.
Include the next digit (3) from the dividend after 95, then repeat: 953 / 210

Moving on to step 7:
210 goes into 953 4 times with a remainder of 113.
The next digit of our result is 4. 
Result so far: 41154.0
If we take 840 away from 953, we end up with 113.
Include the next digit (9) from the dividend after 113, then repeat: 1139 / 210

On to step 8:
If we divide 1139 by 210, we get 5 and a remainder of 89.
The next digit of our result is 5. 
Result so far: 411545.0
Subtract 1050 from 1139 to get 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Step 9:
When dividing 890 by 210, we get 4 with a remainder of 50.
Record the quotient 4 as the next digit in the result. 
Result so far: 411545.4
The remainder is 50 after subtracting 840 from 890.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 10:
210 goes into 500 2 times with a remainder of 80.
Put 2 as the next digit of the answer. 
Result so far: 411545.42
If we take 420 away from 500, we end up with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Step 11:
210 can be fit into 800 3 times, resulting in a remainder of 170.
Write down 3 as next digit of the result. 
Result so far: 411545.423
If we take 630 away from 800, we end up with 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Advancing to step 12:
When dividing 1700 by 210, we get 8 with a remainder of 20.
The next digit of our result is 8. 
Result so far: 411545.4238
Subtract 1680 from 1700 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 13:
200 divided by 210 is 0 with a remainder of 200.
Write down 0 as next digit of the result. 
Result so far: 411545.4238
If we subtract 0 from 200, we get 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Step 14:
2000 divided by 210 is 9 with a remainder of 110.
Record the quotient 9 as the next digit in the result. 
Result so far: 411545.423809
Subtracting 1890 from 2000 leaves us with 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Advancing to step 15:
When dividing 1100 by 210, we get 5 with a remainder of 50.
The number 5 becomes the next digit in our result. 
Result so far: 411545.4238095
If we subtract 1050 from 1100, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

On to step 16:
When dividing 500 by 210, we get 2 with a remainder of 80.
Record the quotient 2 as the next digit in the result. 
Result so far: 411545.42380952
The remainder is 80 after subtracting 420 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

The final result is 411545.42380952 with a remainder of 8e-08.