You can follow the same steps to divide a 4-digit number by a 2-digit number. Try it with Write the problem with the long division symbol.
To start, find how many times 21 goes into 85.
You can use estimation to help. The number 21 is close to 20, and 85 is close to 80. Since you can estimate that 21 goes into 85 about 4 times. Next, bring the 2 down from the tens place to make the number 12.
How many times does 21 go into 12? Then, bring down the 6 from the ones place to make the number 126.
How many times does 21 go into 126?
You can use estimation again. The number 21 is close to 20, and 126 is close to 120. Since you can estimate that 21 goes into 126 about 6 times. We have 0 left over. That means there is no remainder.