A group of five- and six-year-olds watch a teacher demonstrate measuring things with a standard ruler. Some students want to know why the teacher aligns the number 0 on the ruler with the first edge of an object, instead of starting with the number 1 as they do when they count. Which choice is the best answer for the teacher to give?

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A group of five- and six-year-olds watch a teacher demonstrate measuring things with a standard ruler.  Some students want to know why the teacher aligns the number 0 on the ruler with the first edge of an object, instead of starting with the number 1 as they do when they count.  Which choice is the best answer for the teacher to give?






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