Florida B.E.S.T. MA.2.M.1.2

Math2nd GradeMeasure the length of objects and solve problems involving length.

The Standard

Measure the lengths of two objects using the same unit and determine the difference between their measurements.

Florida B.E.S.T. Standards for Mathematics

Teacher's field guide

What Students Need to Do: Students measure two objects using the same unit, such as centimeters or inches. They compare the measurements and subtract to find how much longer one object is.
What Mastery Looks Like: Students line up each object with zero and measure both using the same unit. They subtract the shorter length from the longer length and label the answer correctly.
Common Misconceptions: Students may start measuring at the 1 mark instead of 0. They may mix units, subtract in the wrong order, or give one object’s length instead of the difference.
How to Assess It: Give each student an 8 centimeter strip and a 13 centimeter strip. Ask them to measure both, write a subtraction equation, and label the difference.

Lesson moves

Pairs measure a pencil and marker in centimeters, record both lengths, then subtract to find the difference.
Ask students to write why two lengths must use the same unit before they can be compared.
Play Difference Match by pairing object measurement cards with the correct subtraction equation and difference card.
Students measure two shoes in centimeters and find how much longer one shoe is than the other.

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