We look at the division of 13947694 by 870 
The aim is to understand the frequency of 870 in 13947694.

On to step 1:
If we divide 1 by 870, we get 0 and a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 870

On to step 2:
The number 870 fits into 13 0 times, leaving a remainder of 13.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 13, we end up with 13.
Append the next digit (9) from the dividend to 13 and continue with: 139 / 870

Step 3:
870 goes into 139 0 times with a remainder of 139.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 139 and we're left with 139.
Append the next digit (4) from the dividend to 139 and continue with: 1394 / 870

Moving on to step 4:
870 goes into 1394 1 times with a remainder of 524.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 870 from 1394 to get 524.
Grab the next digit (7) from the dividend, add it to 524, then carry on: 5247 / 870

On to step 5:
5247 divided by 870 is 6 with a remainder of 27.
Write down 6 as next digit of the result. 
Result so far: 16.0
Subtracting 5220 from 5247 leaves us with 27.
Include the next digit (6) from the dividend after 27, then repeat: 276 / 870

On to step 6:
When dividing 276 by 870, we get 0 with a remainder of 276.
The next digit of our result is 0. 
Result so far: 160.0
Subtracting 0 from 276 leaves us with 276.
Include the next digit (9) from the dividend after 276, then repeat: 2769 / 870

Going ahead to step 7:
When dividing 2769 by 870, we get 3 with a remainder of 159.
The next digit of our result is 3. 
Result so far: 1603.0
If we take 2610 away from 2769, we end up with 159.
Include the next digit (4) from the dividend after 159, then repeat: 1594 / 870

Moving on to step 8:
The number 870 fits into 1594 1 times, leaving a remainder of 724.
Record the quotient 1 as the next digit in the result. 
Result so far: 16031.0
The remainder is 724 after subtracting 870 from 1594.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7240, and continue the process.

Moving on to step 9:
7240 divided by 870 is 8 with a remainder of 280.
Write down 8 as next digit of the result. 
Result so far: 16031.8
Subtracting 6960 from 7240 leaves us with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Moving on to step 10:
870 can be fit into 2800 3 times, resulting in a remainder of 190.
Use 3 as the next digit of our solution. 
Result so far: 16031.83
The remainder is 190 after subtracting 2610 from 2800.
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 11:
1900 divided by 870 is 2 with a remainder of 160.
Put 2 as the next digit of the answer. 
Result so far: 16031.832
Subtract 1740 from 1900 to get 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Step 12:
870 can be fit into 1600 1 times, resulting in a remainder of 730.
The next digit of our result is 1. 
Result so far: 16031.8321
Deduct 870 from 1600 and we're left with 730.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7300, and continue the process.

Moving on to step 13:
7300 divided by 870 is 8 with a remainder of 340.
Write down 8 as next digit of the result. 
Result so far: 16031.83218
Deduct 6960 from 7300 and we're left with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Advancing to step 14:
870 can be fit into 3400 3 times, resulting in a remainder of 790.
Record the quotient 3 as the next digit in the result. 
Result so far: 16031.832183
Subtracting 2610 from 3400 leaves us with 790.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7900, and continue the process.

Moving on to step 15:
870 goes into 7900 9 times with a remainder of 70.
Record the quotient 9 as the next digit in the result. 
Result so far: 16031.8321839
If we take 7830 away from 7900, we end up with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Advancing to step 16:
870 goes into 700 0 times with a remainder of 700.
Record the quotient 0 as the next digit in the result. 
Result so far: 16031.8321839
The remainder is 700 after subtracting 0 from 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7000, and continue the process.

The final outcome is 16031.8321839, with a leftover of 7e-07.