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Module 2 Lesson 9 Measure and compare lengths

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Review Mei’s frog leaped several centimeters. Then it leaped 34 centimeters. In all, it leaded 50 centimeter. How far did Mei’s frog leap at first? Draw a picture and write a number sentence to explain. Read-read and if necessary re-read Understand- Underline what you know- Circle what you need to find out Solve – plan how it will be solved Check- does it make sense? ____ cm. + ____ cm. = 50cm.

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Activity on the floor with teacher Will need meters and yarn

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Next slide will be reviewing the activity

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Can we estimate the length of the squiggly line and the zigzag line? Why can’t we estimate the lengths? Which line do you think is longer? line A line B

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How can you find the actual length? Stretch them out and measure each part using string. line A line B

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How can you find the actual length? Draw a diagram line A line B 3 meters 5 meters Are my lines really 3 and 5 meters long on the board? No. This is called a tape diagram. This is helpful because I can draw a small picture to show any length.

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Draw the diagram line A line B 3 meters 5 meters Is my diagram correct? No, the 5 meter line needs to be a little longer. Lets draw the 5 meter line a little long.

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You got it! line A line B 3 meters 5 meters What number sentence could we write to show the total length of the strings? 3 + 5 = _____

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Draw the diagram line A line B 3 meters 5 meters What number sentence could we write to show the difference in length between the two string? 5 – 3 = _____

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Practicing Tape Diagrams Let’s say the string around my wrist is 16 cm. and then string around my head is 38 cm. Can I draw the my actual head and wrist on my paper?

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Tape Diagrams Let’s draw a diagram that represents my wrist and head. Wrist Head 16 cm. 38 cm. Do my diagrams make sense?

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Tape Diagrams Let’s draw a diagram that represents my wrist and head. wrist head 16 cm. 38 cm. What is this open space between the end of the first and second bar?

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Tape Diagrams The difference is how much longer the 38 cm. is than the 16 cm. wrist head 16 cm. 38 cm. Difference

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Tape Diagrams Write a number sentence to show what the difference is between my head and wrist. wrist head 16 cm. 38 cm. Difference 38 cm. – 16 cm. = _____

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16 cm. + 38 cm. = ____ Work it Out

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Tape Diagrams Is there another way? wrist head 16 cm. 38 cm. Difference 16 cm. + ____ = 38 cm.

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16 cm. + ___ cm. = 38 cm. Work it Out

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Problem Set

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Exit Ticket

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