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.

140 + 400 = ?

140 + 420 = 560

To estimate the sum of Natalie's DVDs and CDs, you can simply add up the number of DVDs and CDs she has.

Sentence: Natalie has approximately 138 DVDs and 419 CDs, so the estimated sum of her DVDs and CDs is roughly 557.

Estimated sum: 138 (DVDs) + 419 (CDs) = 557