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Home > CC1 > Chapter 8 > Lesson 8.1.4 > Problem 8-53

8-53.

Maciel and Alejandro were trying to figure out the answer to 8.42 + 0.3. Maciel thinks the answer is 8.72, but Alejandro got 8.45. Who is correct? Why? What did the other person do wrong? Homework Help ✎

Think about the meaning of 0.3. Does it mean 3 tenths? 3 hundreths? 3 thousandths? Which part of 8.42 has the same place value?

0.3 means 3 tenths. 8.42 means 8 wholes, 4 tenths, and 2 hundreths. Can you combine these values now?

Maciel is correct. Can you explain how Alejandro found the wrong sum?