Reflection: Checks for Understanding Perimeter of my fence - Section 2: Independent Practice

The student in this video Finding the Perimeter is measuring in centimeters but he consistently places the ruler with the inches side next to what he is measuring and then tries to read the centimeter side of the ruler. I keep trying to help him slide the ruler down so he is actually measuring with the centimeter edge. I want him to learn to use the tool (the ruler) correctly (MP5). He is measuring with centimeters as the instructions said, but he is trying to do it across the ruler. He has a hard time understanding why I keep sliding the ruler down so that the centimeter edge is next to the line he is measuring.

The student measures all the sides and creates a Tens and Ones house to add his numbers. He records all the 2 digit numbers correctly but then when the last line is only 6 centimeters long, he records it as 6 tens. I have to ask him if he just measured 6 tens or 6 ones. Here he is learning that attending to where he puts the numbers will make a difference in the answer. Place value is important and he must be careful to think about place value even when he is measuring (MP6).

He shows some understanding of place value in the way he writes the numbers and then when he is adding, he adds the tens first and finds 3 tens, but when he has 12 ( which he realizes with my help should be 14 ones), he quickly changes the 3 tens to 4 tens, showing that he knows that he needs to move the tens into the tens column.

Checks for Understanding: Using The Ruler Appropriately

Perimeter of my fence

Unit 13: Area, Perimeter and More Measurement
Lesson 2 of 6

Big Idea: A farmer needs a fence to keep the bunny out of his lettuce patch, but does he understand how to buy the right amount?

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50 minutes

Beth McKenna

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