Headline Story
Skip-Counting and Equivalent Sets, #8
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Introduction
Share the Headline Story with the class. Sometimes it helps children to review what they do know and what they don’t know. In this problem, they know that some of the numbers belong together and one number does not. They don’t know which number does not belong.
Headline Story
Which number does not belong with the others? Why?
5, 18, 25, 15, 10, 35
Possible student responses
- 18 does not belong because it is the only number that is not a multiple of 5.
- 5 does not belong because it is the only one-digit number.
- 25 does not belong because it is the only square number.
- 10 does not belong because it is the only multiple of 10.
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