### Home > INT2 > Chapter 5 > Lesson 5.1.2 > Problem 5-21

What is special about the number zero? Think about this as you answer the questions below.

Copy each problem and calculate each sum:

What is special about adding zero? Write a sentence that begins, “When you add zero to a number, …”

Julia is thinking of two numbers,

and. When she adds them together, she gets a sum of. Does that tell you anything about either of Julia’s numbers?

What did you notice about each of the answers in part (a)?

Copy each problem and calculate each product:

What is special about multiplying by zero? Write a sentence that begins, “When you multiply a number by zero, …”

When you multiply a number by

, … *the result is always**.*Julia is thinking of two numbers,

and. When she multiplies them together, she gets a product of. Does that tell you anything about either of Julia’s numbers?