Estimate each sum or difference by rounding to the greatst place value.

38,347+17,039

would it be
40,000+20,000=60,000

Yes.

there are 5 boys in a class of 20 students, what percent are boys?

5/20

To estimate the sum 38,347 + 17,039 by rounding to the greatest place value, you need to look at the largest place value in each number. In this case, it is the ten thousands place.

For 38,347, the digit in the ten thousands place is 3. Since it is less than 5, we can round it down to 30,000. The other digits (thousands, hundreds, and tens) can be dropped since we are rounding to the ten thousands place.

For 17,039, the digit in the ten thousands place is 1. Again, since it is less than 5, we can round it down to 10,000. The other digits can be dropped.

Now, you can add the rounded numbers: 30,000 + 10,000 = 40,000.

So, using rounding to the greatest place value, the estimated sum of 38,347 + 17,039 is approximately 40,000.