- Second Grade
- 65 minutes
- Standards: 2.MD.A.1
Help your students use rulers in the classroom with this lesson! Encourage them to measure items around them using centimeters to understand shapes and sizes.
Students will be able to use standard measures of length and measure using a ruler.
Introduction (10 minutes)
- Watch Measuring to the nearest cm and mm by 2minutemath.
- After watching the video, ask your students what they can measure in real life.
Explicit Instruction/Teacher Modeling (15 minutes)
- Give your students rulers, and ask them to see what units of length they see.
- Review how to measure an object with a ruler by starting at the 0 mark and measuring straight across.
- Acknowledge that some objects aren't exact, so decimals or fractions are necessary to record an exact measurement.
- Demonstrate on the whiteboard how to measure 3.4 centimeters. Draw several lines for practice.
Guided Practice/Interactive Modeling (15 minutes)
- Demonstrate to students that 3.4 centimeters can also be written as 34 millimeters.
- Instruct your students to measure lines of different sizes and write them the two ways that they just learned.
Independent Working Time (15 minutes)
- Give your students the Length in Centimeters worksheet to complete.
- Enrichment: Have your students complete the Measuring Length in Centimeters worksheet.
- Support: Before working on decimals, have your students master the concept of measuring to a whole number. Throughout this activity, have them round up or down to the nearest whole number instead of using decimals or fractions.
Assessment (5 minutes)
- Circulate and provide support where needed.
- Make sure that your students are using their rulers from the correct side.
Review and Closing (5 minutes)
- Ask your students to practice estimating the length of pencils in the classrooms.
- Test the guesses by pulling out your ruler and checking!