Maryland Math 2.GR.A.1

Math2nd GradeGeometric Reasoning and Measurement

The Standard

Measure the length of an object to the nearest whole unit by using appropriate tools (e.g., rulers, yardsticks, meter sticks, and measuring tapes).

Maryland College and Career Ready Standards for Mathematics (2025) · MEASURE AND ESTIMATE LENGTHS IN STANDARD UNITS.

Teacher's field guide

What Students Need to Do: Students choose a ruler, yardstick, meter stick, or measuring tape that fits the object. They line up zero with one end and read the nearest whole unit at the other end.
What Mastery Looks Like: A student uses a ruler for a pencil and a measuring tape for a desk. They record the unit and choose the closer whole-number mark when an end falls between marks.
Common Misconceptions: Some students start at the ruler's edge instead of the zero mark. Others place the object at 1 and report the number at its far end as its length. Some always round up when an end falls between marks.
How to Assess It: Ask students to measure a pencil to the nearest whole centimeter. Have them mark where they placed zero and write the length with its unit.

Lesson moves

Give pairs a ruler and a measuring tape to measure a crayon and a desk, then record each length to the nearest whole centimeter.
Show an eraser starting at 1 cm on a ruler and ask, 'Why is the number at its far end not its length?'
Cut five paper strips and make matching length cards; students measure each strip and match it to the nearest whole centimeter.
Have students measure a classroom shelf with a tape measure and record its length to the nearest whole centimeter for a paper liner.

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