We look at the division of 770589 by 21 
We want to figure out the number of times 770589 can be divided by 21.

Advancing to step 1:
21 goes into 7 0 times with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Grab the next digit (7) from the dividend, add it to 7, then carry on: 77 / 21

Let's proceed to step 2:
21 goes into 77 3 times with a remainder of 14.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we take 63 away from 77, we end up with 14.
Bring next digit (0) of the dividend behind the 14 and repeat the process: 140 / 21

Advancing to step 3:
21 goes into 140 6 times with a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 36.0
The remainder is 14 after subtracting 126 from 140.
Bring next digit (5) of the dividend behind the 14 and repeat the process: 145 / 21

Moving on to step 4:
21 goes into 145 6 times with a remainder of 19.
Record the quotient 6 as the next digit in the result. 
Result so far: 366.0
Deduct 126 from 145 and we're left with 19.
Take the next digit (8) from the dividend and append it to 19, then repeat: 198 / 21

Step 5:
If we divide 198 by 21, we get 9 and a remainder of 9.
Record the quotient 9 as the next digit in the result. 
Result so far: 3669.0
If we subtract 189 from 198, we get 9.
Grab the next digit (9) from the dividend, add it to 9, then carry on: 99 / 21

On to step 6:
When dividing 99 by 21, we get 4 with a remainder of 15.
Put 4 as the next digit of the answer. 
Result so far: 36694.0
If we subtract 84 from 99, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 7:
If we divide 150 by 21, we get 7 and a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 36694.7
Subtract 147 from 150 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 8:
When dividing 30 by 21, we get 1 with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 36694.71
Deduct 21 from 30 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 9:
When dividing 90 by 21, we get 4 with a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 36694.714
If we take 84 away from 90, we end up 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.

Moving on to step 10:
The number 21 fits into 60 2 times, leaving a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 36694.7142
Deduct 42 from 60 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 11:
21 goes into 180 8 times with a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 36694.71428
The remainder is 12 after subtracting 168 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 12:
If we divide 120 by 21, we get 5 and a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 36694.714285
If we subtract 105 from 120, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 13:
When dividing 150 by 21, we get 7 with a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 36694.7142857
Deduct 147 from 150 and we're left 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.

Let's proceed to step 14:
The number 21 fits into 30 1 times, leaving a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 36694.71428571
Deduct 21 from 30 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Our division results in 36694.71428571 with a remaining 9e-09.