We divide 3156451 by 210
The aim is to understand the frequency of 210 in 3156451.

Step 1:
210 goes into 3 0 times with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Bring next digit (1) of the dividend behind the 3 and repeat the process: 31 / 210

Going ahead to step 2:
210 goes into 31 0 times with a remainder of 31.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 31 to get 31.
Bring next digit (5) of the dividend behind the 31 and repeat the process: 315 / 210

Moving on to step 3:
If we divide 315 by 210, we get 1 and a remainder of 105.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 105 after subtracting 210 from 315.
Take the next digit (6) from the dividend and append it to 105, then repeat: 1056 / 210

On to step 4:
210 goes into 1056 5 times with a remainder of 6.
Use 5 as the next digit of our solution. 
Result so far: 15.0
Deduct 1050 from 1056 and we're left with 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 210

Moving on to step 5:
The number 210 fits into 64 0 times, leaving a remainder of 64.
The number 0 becomes the next digit in our result. 
Result so far: 150.0
Subtracting 0 from 64 leaves us with 64.
Append the next digit (5) from the dividend to 64 and continue with: 645 / 210

Advancing to step 6:
210 goes into 645 3 times with a remainder of 15.
Use 3 as the next digit of our solution. 
Result so far: 1503.0
Subtract 630 from 645 to get 15.
Append the next digit (1) from the dividend to 15 and continue with: 151 / 210

Step 7:
The number 210 fits into 151 0 times, leaving a remainder of 151.
Put 0 as the next digit of the answer. 
Result so far: 15030.0
If we subtract 0 from 151, we get 151.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1510, and continue the process.

Going ahead to step 8:
210 can be fit into 1510 7 times, resulting in a remainder of 40.
Write down 7 as next digit of the result. 
Result so far: 15030.7
Subtract 1470 from 1510 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 9:
If we divide 400 by 210, we get 1 and a remainder of 190.
Use 1 as the next digit of our solution. 
Result so far: 15030.71
If we subtract 210 from 400, we get 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Going ahead to step 10:
If we divide 1900 by 210, we get 9 and a remainder of 10.
Write down 9 as next digit of the result. 
Result so far: 15030.719
If we subtract 1890 from 1900, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 11:
If we divide 100 by 210, we get 0 and a remainder of 100.
Write down 0 as next digit of the result. 
Result so far: 15030.719
Subtracting 0 from 100 leaves us with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

On to step 12:
If we divide 1000 by 210, we get 4 and a remainder of 160.
Put 4 as the next digit of the answer. 
Result so far: 15030.71904
If we take 840 away from 1000, we end up with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Moving on to step 13:
210 can be fit into 1600 7 times, resulting in a remainder of 130.
Record the quotient 7 as the next digit in the result. 
Result so far: 15030.719047
Subtract 1470 from 1600 to get 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Let's proceed to step 14:
1300 divided by 210 is 6 with a remainder of 40.
Put 6 as the next digit of the answer. 
Result so far: 15030.7190476
The remainder is 40 after subtracting 1260 from 1300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 15:
The number 210 fits into 400 1 times, leaving a remainder of 190.
Write down 1 as next digit of the result. 
Result so far: 15030.71904761
Deduct 210 from 400 and we're left with 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

After the division, we end up with 15030.71904761 and a remainder of 1.9e-07.