The Smaller They Come
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!