Measuring length (age 6+)
PROCEDURALMeasure the length of an object using same-size length units laid end to end with no gaps or overlaps
Mastery Evidence
- Measure a book by laying paper clips end to end and counting them
- Understand that the length measurement is the number of units that span the object
- Avoid gaps and overlaps when placing units
Assessment Prompt
“If [child] is measuring the length of a table using identical toy bricks, can they lay them end to end with no gaps — and tell you how many bricks long the table is?”
Curriculum Standards1 alignment
1.MD.2Common Core State Standards for MathematicsExpress 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.
Prerequisites2
- Measuring length and height (age 5+)hardAges 5—6
- Measuring lengthsoftAges 6—7
Show full prerequisite tree
- Measuring length and height (age 5+) hard
Measuring with iterated units extends Y1 beginning to measure length
- Comparing Lengths & Heights hard
Measuring length with units requires first being able to compare lengths directly
- Measurable Attributes of Objects hard
Comparing lengths/heights requires first identifying length as a measurable attribute
- Comparing Lengths & Heights hard
Ordering 3 objects by length and indirect comparison extends direct length comparison
- Measurable Attributes of Objects hard
Comparing lengths/heights requires first identifying length as a measurable attribute
Unlocks2
- Measuring length (age 7+)hardAges 7—8
- Numbers on a number linesoftAges 6—7