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5-21.

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

  1. Copy each problem and calculate each sum:

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

  1. 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)?

  1. Copy each problem and calculate each product:

  1. 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 .

  2. 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?