Let's divide 21505488 by 400
Let's see how many times 400 fits into 21505488.

Step 1:
2 divided by 400 is 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 400

Moving on to step 2:
If we divide 21 by 400, we get 0 and a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Include the next digit (5) from the dividend after 21, then repeat: 215 / 400

Let's proceed to step 3:
400 can be fit into 215 0 times, resulting in a remainder of 215.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 215 to get 215.
Bring next digit (0) of the dividend behind the 215 and repeat the process: 2150 / 400

Moving on to step 4:
When dividing 2150 by 400, we get 5 with a remainder of 150.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
The remainder is 150 after subtracting 2000 from 2150.
Grab the next digit (5) from the dividend, add it to 150, then carry on: 1505 / 400

Going ahead to step 5:
400 can be fit into 1505 3 times, resulting in a remainder of 305.
Record the quotient 3 as the next digit in the result. 
Result so far: 53.0
If we subtract 1200 from 1505, we get 305.
Grab the next digit (4) from the dividend, add it to 305, then carry on: 3054 / 400

Going ahead to step 6:
When dividing 3054 by 400, we get 7 with a remainder of 254.
Put 7 as the next digit of the answer. 
Result so far: 537.0
Deduct 2800 from 3054 and we're left with 254.
Append the next digit (8) from the dividend to 254 and continue with: 2548 / 400

Going ahead to step 7:
400 goes into 2548 6 times with a remainder of 148.
Write down 6 as next digit of the result. 
Result so far: 5376.0
Deduct 2400 from 2548 and we're left with 148.
Fetch the next digit (8) from the dividend, attach it to 148 and continue: 1488 / 400

Advancing to step 8:
400 can be fit into 1488 3 times, resulting in a remainder of 288.
Record the quotient 3 as the next digit in the result. 
Result so far: 53763.0
If we take 1200 away from 1488, we end up with 288.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2880, and continue the process.

Advancing to step 9:
When dividing 2880 by 400, we get 7 with a remainder of 80.
The number 7 becomes the next digit in our result. 
Result so far: 53763.7
Subtracting 2800 from 2880 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

On to step 10:
When dividing 800 by 400, we get 2 with a remainder of 0.
Record the quotient 2 as the next digit in the result. 
Result so far: 53763.72
Subtracting 800 from 800 leaves us 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.

Let's proceed to step 11:
When dividing 0 by 400, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 53763.72
Deduct 0 from 0 and we're left 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.

Let's proceed to step 12:
If we divide 0 by 400, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 53763.72
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.

Our division results in 53763.72 with a remaining 0.0.