63645548 divided by 7 
The aim is to understand the frequency of 7 in 63645548.

Advancing to step 1:
The number 7 fits into 6 0 times, leaving a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Take the next digit (3) from the dividend and append it to 6, then repeat: 63 / 7

Step 2:
63 divided by 7 is 9 with a remainder of 0.
Write down 9 as next digit of the result. 
Result so far: 9.0
The remainder is 0 after subtracting 63 from 63.
Grab the next digit (6) from the dividend, add it to 0, then carry on: 6 / 7

Advancing to step 3:
7 can be fit into 6 0 times, resulting in a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 90.0
Subtracting 0 from 6 leaves us with 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 7

Going ahead to step 4:
When dividing 64 by 7, we get 9 with a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 909.0
Deduct 63 from 64 and we're left with 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 7

Moving on to step 5:
The number 7 fits into 15 2 times, leaving a remainder of 1.
Use 2 as the next digit of our solution. 
Result so far: 9092.0
Deduct 14 from 15 and we're left with 1.
Append the next digit (5) from the dividend to 1 and continue with: 15 / 7

Advancing to step 6:
7 goes into 15 2 times with a remainder of 1.
Record the quotient 2 as the next digit in the result. 
Result so far: 90922.0
If we take 14 away from 15, we end up with 1.
Append the next digit (4) from the dividend to 1 and continue with: 14 / 7

On to step 7:
7 goes into 14 2 times with a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 909222.0
Subtracting 14 from 14 leaves us with 0.
Append the next digit (8) from the dividend to 0 and continue with: 8 / 7

Advancing to step 8:
The number 7 fits into 8 1 times, leaving a remainder of 1.
The next digit of our result is 1. 
Result so far: 9092221.0
Subtracting 7 from 8 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 9:
7 can be fit into 10 1 times, resulting in a remainder of 3.
Use 1 as the next digit of our solution. 
Result so far: 9092221.1
Subtracting 7 from 10 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 10:
The number 7 fits into 30 4 times, leaving a remainder of 2.
Write down 4 as next digit of the result. 
Result so far: 9092221.14
The remainder is 2 after subtracting 28 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 11:
7 can be fit into 20 2 times, resulting in a remainder of 6.
The number 2 becomes the next digit in our result. 
Result so far: 9092221.142
Subtracting 14 from 20 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 12:
60 divided by 7 is 8 with a remainder of 4.
Write down 8 as next digit of the result. 
Result so far: 9092221.1428
If we subtract 56 from 60, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 13:
If we divide 40 by 7, we get 5 and a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 9092221.14285
Subtract 35 from 40 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 14:
When dividing 50 by 7, we get 7 with a remainder of 1.
Put 7 as the next digit of the answer. 
Result so far: 9092221.142857
Deduct 49 from 50 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 15:
10 divided by 7 is 1 with a remainder of 3.
Write down 1 as next digit of the result. 
Result so far: 9092221.1428571
The remainder is 3 after subtracting 7 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 16:
When dividing 30 by 7, we get 4 with a remainder of 2.
Use 4 as the next digit of our solution. 
Result so far: 9092221.14285714
Subtracting 28 from 30 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The quotient of the division is 9092221.14285714, and the remainder is 2e-09.