We're dividing 71608990 by 878 
The aim is to understand the frequency of 878 in 71608990.

On to step 1:
If we divide 7 by 878, we get 0 and a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Include the next digit (1) from the dividend after 7, then repeat: 71 / 878

Step 2:
When dividing 71 by 878, we get 0 with a remainder of 71.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 71 after subtracting 0 from 71.
Take the next digit (6) from the dividend and append it to 71, then repeat: 716 / 878

Going ahead to step 3:
716 divided by 878 is 0 with a remainder of 716.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 716, we end up with 716.
Fetch the next digit (0) from the dividend, attach it to 716 and continue: 7160 / 878

Advancing to step 4:
The number 878 fits into 7160 8 times, leaving a remainder of 136.
Use 8 as the next digit of our solution. 
Result so far: 8.0
If we take 7024 away from 7160, we end up with 136.
Grab the next digit (8) from the dividend, add it to 136, then carry on: 1368 / 878

Going ahead to step 5:
878 goes into 1368 1 times with a remainder of 490.
Write down 1 as next digit of the result. 
Result so far: 81.0
If we take 878 away from 1368, we end up with 490.
Append the next digit (9) from the dividend to 490 and continue with: 4909 / 878

Step 6:
When dividing 4909 by 878, we get 5 with a remainder of 519.
The number 5 becomes the next digit in our result. 
Result so far: 815.0
Deduct 4390 from 4909 and we're left with 519.
Bring next digit (9) of the dividend behind the 519 and repeat the process: 5199 / 878

On to step 7:
If we divide 5199 by 878, we get 5 and a remainder of 809.
Write down 5 as next digit of the result. 
Result so far: 8155.0
Subtract 4390 from 5199 to get 809.
Grab the next digit (0) from the dividend, add it to 809, then carry on: 8090 / 878

Going ahead to step 8:
When dividing 8090 by 878, we get 9 with a remainder of 188.
Put 9 as the next digit of the answer. 
Result so far: 81559.0
The remainder is 188 after subtracting 7902 from 8090.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

On to step 9:
878 can be fit into 1880 2 times, resulting in a remainder of 124.
The next digit of our result is 2. 
Result so far: 81559.2
If we subtract 1756 from 1880, we get 124.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

Moving on to step 10:
878 goes into 1240 1 times with a remainder of 362.
Record the quotient 1 as the next digit in the result. 
Result so far: 81559.21
Subtract 878 from 1240 to get 362.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3620, and continue the process.

Moving on to step 11:
When dividing 3620 by 878, we get 4 with a remainder of 108.
The next digit of our result is 4. 
Result so far: 81559.214
If we take 3512 away from 3620, we end up with 108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

Going ahead to step 12:
If we divide 1080 by 878, we get 1 and a remainder of 202.
The next digit of our result is 1. 
Result so far: 81559.2141
Subtracting 878 from 1080 leaves us with 202.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2020, and continue the process.

On to step 13:
When dividing 2020 by 878, we get 2 with a remainder of 264.
Write down 2 as next digit of the result. 
Result so far: 81559.21412
Subtract 1756 from 2020 to get 264.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2640, and continue the process.

Going ahead to step 14:
When dividing 2640 by 878, we get 3 with a remainder of 6.
The next digit of our result is 3. 
Result so far: 81559.214123
Subtract 2634 from 2640 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 15:
When dividing 60 by 878, we get 0 with a remainder of 60.
Put 0 as the next digit of the answer. 
Result so far: 81559.214123
If we subtract 0 from 60, 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.

Moving on to step 16:
When dividing 600 by 878, we get 0 with a remainder of 600.
Put 0 as the next digit of the answer. 
Result so far: 81559.214123
Deduct 0 from 600 and we're left with 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

After the division, we end up with 81559.214123 and a remainder of 6e-07.