NY Next Generation Math NY-2.MD.5

Math2nd GradeRelate addition and subtraction to length.

The Standard

Use addition and subtraction within 100 to solve word problems involving lengths that are given in the same units.

New York State Next Generation Mathematics Learning Standards

Teacher's field guide

What Students Need to Do: Students use addition or subtraction to solve length stories with values within 100 and measurements in the same unit. They represent the unknown with a drawing or equation and label the answer.
What Mastery Looks Like: A student solves a story about a 63-centimeter ribbon with 18 centimeters cut off and finds 45 centimeters remaining. The student explains why subtraction matches the change in length.
Common Misconceptions: Students may combine measurements written in different units or select an operation from one keyword. They may omit the unit or reverse quantities in a comparison story.
How to Assess It: Present a 27-centimeter strip joined to a 35-centimeter strip. Ask for the total length with a drawing and equation.

Lesson moves

Join or separate measured paper strips, then connect the physical change to an addition or subtraction equation.
Ask students what in a length story tells them whether the total grows, shrinks, or is being compared.
Play length-story sort by matching same-unit situations to drawings, equations, and labeled answers.
Calculate ribbon, trim, or shelf lengths needed for a classroom display using centimeters or inches.

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