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Measuring length
PROCEDURALOrder three objects by length and compare the lengths of two objects indirectly using a third object
Mastery Evidence
- Put three ribbons in order from shortest to longest
- Use a piece of string to compare the heights of two objects that cannot be placed side by side
- Explain that if A is longer than B and B is longer than C, then A is longer than C
Assessment Prompt
“If [child] has three pencils of different lengths but can only compare two at a time, can they figure out which is longest — by using a third pencil as a go-between?”
Curriculum Standards1 alignment
1.MD.1Common Core State Standards for MathematicsOrder and compare objects by length
Order three objects by length; compare the lengths of two objects indirectly by using a third object.
MD
Prerequisites1
- Comparing Lengths & HeightshardAges 4—6
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- 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 6+)softAges 6—7
- Comparing lengths by measuringhardAges 7—8