LESSON 5 Multiples on the Calendar

Mrs. Hunter's class decided to use this month's calendar to find multiples of 2 and to practice writing number sentences. Multiples of a number are the products of that number and any other whole number. For example, 2 × 3 = 6. Six is a multiple of 2 and 3. Mrs. Hunter asked each group to look at today's date and decide whether it is a multiple of 2. If the date is a multiple of two, the group should circle it.

Tara's group saw that the date was September 18. Tara decided that 18 is a multiple of 2 and circled it on the calendar.

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1. What strategies could Tara use to show 18 is a multiple of 2?
2. What number sentence should Tara write to show that 18 is a multiple of 2?
3. If today is September 18, yesterday was the 17th. Is 17 a multiple of 2? Show or tell how you know.
4. To write a number sentence for 17, you will need to use multiplication and addition. Complete this number sentence for 17:

   × 2 + 1 = 17