15243706 ÷ 210 
The aim is to understand the frequency of 210 in 15243706.

Going ahead to step 1:
210 can be fit into 1 0 times, resulting in a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 210

Step 2:
If we divide 15 by 210, we get 0 and a remainder of 15.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 15 and we're left with 15.
Append the next digit (2) from the dividend to 15 and continue with: 152 / 210

Going ahead to step 3:
If we divide 152 by 210, we get 0 and a remainder of 152.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 152 leaves us with 152.
Include the next digit (4) from the dividend after 152, then repeat: 1524 / 210

Step 4:
When dividing 1524 by 210, we get 7 with a remainder of 54.
Use 7 as the next digit of our solution. 
Result so far: 7.0
Deduct 1470 from 1524 and we're left with 54.
Append the next digit (3) from the dividend to 54 and continue with: 543 / 210

Step 5:
When dividing 543 by 210, we get 2 with a remainder of 123.
Write down 2 as next digit of the result. 
Result so far: 72.0
Deduct 420 from 543 and we're left with 123.
Grab the next digit (7) from the dividend, add it to 123, then carry on: 1237 / 210

Advancing to step 6:
The number 210 fits into 1237 5 times, leaving a remainder of 187.
Use 5 as the next digit of our solution. 
Result so far: 725.0
Subtracting 1050 from 1237 leaves us with 187.
Grab the next digit (0) from the dividend, add it to 187, then carry on: 1870 / 210

Step 7:
210 can be fit into 1870 8 times, resulting in a remainder of 190.
Write down 8 as next digit of the result. 
Result so far: 7258.0
Subtracting 1680 from 1870 leaves us with 190.
Append the next digit (6) from the dividend to 190 and continue with: 1906 / 210

Moving on to step 8:
210 goes into 1906 9 times with a remainder of 16.
Use 9 as the next digit of our solution. 
Result so far: 72589.0
Subtracting 1890 from 1906 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 9:
210 can be fit into 160 0 times, resulting in a remainder of 160.
Write down 0 as next digit of the result. 
Result so far: 72589.0
Subtracting 0 from 160 leaves us 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.

Advancing to step 10:
1600 divided by 210 is 7 with a remainder of 130.
The next digit of our result is 7. 
Result so far: 72589.07
If we subtract 1470 from 1600, we 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.

Moving on to step 11:
1300 divided by 210 is 6 with a remainder of 40.
Record the quotient 6 as the next digit in the result. 
Result so far: 72589.076
If we take 1260 away from 1300, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 12:
If we divide 400 by 210, we get 1 and a remainder of 190.
Put 1 as the next digit of the answer. 
Result so far: 72589.0761
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 13:
210 goes into 1900 9 times with a remainder of 10.
The next digit of our result is 9. 
Result so far: 72589.07619
Subtracting 1890 from 1900 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 14:
210 goes into 100 0 times with a remainder of 100.
Record the quotient 0 as the next digit in the result. 
Result so far: 72589.07619
Subtract 0 from 100 to get 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Advancing to step 15:
When dividing 1000 by 210, we get 4 with a remainder of 160.
The next digit of our result is 4. 
Result so far: 72589.0761904
The remainder is 160 after subtracting 840 from 1000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Advancing to step 16:
When dividing 1600 by 210, we get 7 with a remainder of 130.
The next digit of our result is 7. 
Result so far: 72589.07619047
The remainder is 130 after subtracting 1470 from 1600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

The final result is 72589.07619047 with a remainder of 1.3e-07.