Virginia SOL 3.MG.1.b.i
The Standard
length of an object to the nearest U.S. Customary unit (1 2 inch, inch, foot, yard) and metric unit (centimeter, meter)
Virginia Standards of Learning for Mathematics · The student will reason mathematically using standard units (U.S. Customary and metric) with appropriate tools to estimate and measure objects by length, weight/mass, and liquid volume to the nearest half or whole unit.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students estimate an object’s length, select a sensible unit and tool, then measure from zero to the nearest half or whole unit. They use inches, feet, yards, centimeters, and meters, and label each result.
What Mastery Looks Like
- A student chooses a ruler for a pencil and a yardstick or meter stick for larger objects. Estimates are reasonable, tools start at zero, and recorded measurements include the correct unit.
Common Misconceptions
- Students often start at the ruler’s edge instead of the zero mark, or count tick marks rather than spaces. They may choose feet for a pencil or centimeters for a room. Some round to a whole inch when the endpoint is closer to a half inch.
How to Assess It
- Give each student a pencil and a ruler. Have students estimate, then measure its length to the nearest half inch and nearest centimeter.
Lesson moves
Ways to Teach It
Give pairs a ruler, yardstick, and meter stick; have them estimate, measure, and record six classroom objects with units.
Ask, “Would you measure a pencil in inches, feet, centimeters, or meters, and why?” Students defend one choice in writing.
Set up measurement stations; teams earn one point for a close estimate and one point for an accurate measurement.
Have students measure the sides of a bulletin board and calculate how much border trim is needed.
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Related Standards
- 4.MG.1.b.ii
weight/mass of an object to the nearest U.S. Customary unit (ounce, pound) and nearest metric unit (gram, kilogram); and
- 2.MG.1.b.i
the length of an object to the nearest inch, using a ruler;
- 4.MG.1.a.i
length in both U.S. Customary (inch, foot, yard, mile) and metric units (millimeter, centimeter, meter);
- 4.MG.1.b.i
length of an object to the nearest U.S. Customary unit (1 2 inch, 1 4 inch, 1 8 inch, foot, yard) and nearest metric unit (millimeter, centimeter, or meter);
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