90376291 ÷ 870 
The aim is to understand the frequency of 870 in 90376291.

Going ahead to step 1:
If we divide 9 by 870, we get 0 and a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Bring next digit (0) of the dividend behind the 9 and repeat the process: 90 / 870

Moving on to step 2:
90 divided by 870 is 0 with a remainder of 90.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 90, we end up with 90.
Bring next digit (3) of the dividend behind the 90 and repeat the process: 903 / 870

Going ahead to step 3:
The number 870 fits into 903 1 times, leaving a remainder of 33.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 870 from 903 leaves us with 33.
Take the next digit (7) from the dividend and append it to 33, then repeat: 337 / 870

Advancing to step 4:
870 can be fit into 337 0 times, resulting in a remainder of 337.
Put 0 as the next digit of the answer. 
Result so far: 10.0
The remainder is 337 after subtracting 0 from 337.
Grab the next digit (6) from the dividend, add it to 337, then carry on: 3376 / 870

On to step 5:
If we divide 3376 by 870, we get 3 and a remainder of 766.
Put 3 as the next digit of the answer. 
Result so far: 103.0
If we subtract 2610 from 3376, we get 766.
Fetch the next digit (2) from the dividend, attach it to 766 and continue: 7662 / 870

Advancing to step 6:
When dividing 7662 by 870, we get 8 with a remainder of 702.
Put 8 as the next digit of the answer. 
Result so far: 1038.0
If we subtract 6960 from 7662, we get 702.
Fetch the next digit (9) from the dividend, attach it to 702 and continue: 7029 / 870

Advancing to step 7:
870 can be fit into 7029 8 times, resulting in a remainder of 69.
Record the quotient 8 as the next digit in the result. 
Result so far: 10388.0
Subtract 6960 from 7029 to get 69.
Append the next digit (1) from the dividend to 69 and continue with: 691 / 870

Let's proceed to step 8:
The number 870 fits into 691 0 times, leaving a remainder of 691.
Record the quotient 0 as the next digit in the result. 
Result so far: 103880.0
Subtract 0 from 691 to get 691.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6910, and continue the process.

Moving on to step 9:
If we divide 6910 by 870, we get 7 and a remainder of 820.
Put 7 as the next digit of the answer. 
Result so far: 103880.7
Subtracting 6090 from 6910 leaves us with 820.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8200, and continue the process.

On to step 10:
When dividing 8200 by 870, we get 9 with a remainder of 370.
Use 9 as the next digit of our solution. 
Result so far: 103880.79
Subtracting 7830 from 8200 leaves us with 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3700, and continue the process.

Let's proceed to step 11:
3700 divided by 870 is 4 with a remainder of 220.
Put 4 as the next digit of the answer. 
Result so far: 103880.794
Deduct 3480 from 3700 and we're left with 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

On to step 12:
When dividing 2200 by 870, we get 2 with a remainder of 460.
Use 2 as the next digit of our solution. 
Result so far: 103880.7942
Subtracting 1740 from 2200 leaves us with 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

On to step 13:
4600 divided by 870 is 5 with a remainder of 250.
The number 5 becomes the next digit in our result. 
Result so far: 103880.79425
Deduct 4350 from 4600 and we're left with 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

Going ahead to step 14:
870 can be fit into 2500 2 times, resulting in a remainder of 760.
The next digit of our result is 2. 
Result so far: 103880.794252
The remainder is 760 after subtracting 1740 from 2500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7600, and continue the process.

Let's proceed to step 15:
If we divide 7600 by 870, we get 8 and a remainder of 640.
Write down 8 as next digit of the result. 
Result so far: 103880.7942528
Subtract 6960 from 7600 to get 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6400, and continue the process.

Going ahead to step 16:
870 can be fit into 6400 7 times, resulting in a remainder of 310.
The number 7 becomes the next digit in our result. 
Result so far: 103880.79425287
Subtract 6090 from 6400 to get 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

After the division, we end up with 103880.79425287 and a remainder of 3.1e-07.