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Module 2

Module 2 . Lesson 9 Measure and compare lengths. 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. ____ cm. + ____ cm. = 50cm.

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Module 2

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  1. Module 2 Lesson 9 Measure and compare lengths

  2. 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. ____ cm. + ____ cm. = 50cm. 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?

  3. Activity on the floor with teacher Will need meters and yarn

  4. Next slide will be reviewing the activity

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

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

  7. How can you find the actual length? Draw a diagram 3 meters line A 5 meters line B 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.

  8. Draw the diagram 3 meters line A line B 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.

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

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

  11. 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?

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

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

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

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

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

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

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

  19. Problem Set

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  23. Exit Ticket

  24. Exit Ticket

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