The Smaller They Come
Students will be able to use metric units of length.
- Watch Measuring to the nearest cm and mmBy 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 zero 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 practise.
Guided practise(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.
- Circulate and provide support where needed.
- Make sure that your students are using their rulers from the correct side.
- Collect student work as a formative assessment to check for understanding.
Review and closing(5 minutes)
- Ask students to complete a think-pair-share, responding to one of the following sentence stems:
- One of the units of length we learned about today was ____.
- My favorite part of the lesson was ____.
- I feel ____(good/okay/confused) about using a ruler because ____.