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Common Core Teaching Resources

CCSS.MATH.CONTENT.1.MD.A.2

In Grade 1 Standards for Mathematical Practice Measurement & Data Measure lengths indirectly and by iterating length units
Express the length of an object as a whole number of length units, by laying multiple copies of a shorter object (the length unit) end to end; understand that the length measurement of an object is the number of same-size length units that span it with no gaps or overlaps. Limit to contexts where the object being measured is spanned by a whole number of length units with no gaps or overlaps.