951510 ÷ 21 
We want to figure out the number of times 951510 can be divided by 21.

Let's proceed to step 1:
If we divide 9 by 21, we get 0 and a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Take the next digit (5) from the dividend and append it to 9, then repeat: 95 / 21

Step 2:
21 goes into 95 4 times with a remainder of 11.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
The remainder is 11 after subtracting 84 from 95.
Append the next digit (1) from the dividend to 11 and continue with: 111 / 21

Going ahead to step 3:
111 divided by 21 is 5 with a remainder of 6.
Write down 5 as next digit of the result. 
Result so far: 45.0
Subtracting 105 from 111 leaves us with 6.
Grab the next digit (5) from the dividend, add it to 6, then carry on: 65 / 21

Let's proceed to step 4:
21 goes into 65 3 times with a remainder of 2.
Put 3 as the next digit of the answer. 
Result so far: 453.0
Deduct 63 from 65 and we're left with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 21

On to step 5:
If we divide 21 by 21, we get 1 and a remainder of 0.
The next digit of our result is 1. 
Result so far: 4531.0
Subtracting 21 from 21 leaves us with 0.
Take the next digit (0) from the dividend and append it to 0, then repeat: 0 / 21

Moving on to step 6:
The number 21 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 45310.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 7:
21 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 45310.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 8:
The number 21 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 45310.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 45310.0, and the remainder is 0.0.