Natalie has 138 dvds and 419 cds. If you were to estimate the sum of the dvds and cds, what sentence could you write? Then find your estimated sum. My answer is 140 + 420 = 560 is this right..

Yes

Possible answers : 140+420+560 or 100+400 = 500!

It would be 100 + 400 because it rounds to the highest place value.

To estimate the sum of Natalie's DVDs and CDs, you can round the number of DVDs and CDs to the nearest tens or hundreds place.

In this case, Natalie has 138 DVDs, which rounded to the nearest tens place is 140. She also has 419 CDs, which rounded to the nearest hundreds place is 400.

To write a sentence to represent the estimated sum, you can say: "Rounding Natalie's 138 DVDs to 140 and her 419 CDs to 400, the estimated sum of her DVDs and CDs is approximately 540."

So, the estimated sum is 140 + 400 = 540.