module 2
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
Module 2Lesson 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.
Read-read and if necessary re-readUnderstand- Underline what you know- Circle what you need to find outSolve – plan how it will be solvedCheck- does it make sense?
____ cm. + ____ cm. = 50cm.
Activity on the floor with teacher
Will need meters and yarn
Next slide will be reviewing the activity
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
How can you find the actual length?
Stretch them out and measure each part using string.
line A line B
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.
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.
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 = _____
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 = _____
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?
Tape Diagrams
Let’s draw a diagram that represents my wrist and head.
Wrist
Head
16 cm.
38 cm.
Do my diagrams make sense?
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?
Tape Diagrams
The difference is how much longer the 38 cm. is than the 16 cm.
wrist
head
16 cm.
38 cm.
Difference
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. = _____
16 cm. + 38 cm. = ____
Work it Out
Tape Diagrams
Is there another way?
wrist
head
16 cm.
38 cm.
Difference
16 cm. + ____ = 38 cm.
16 cm. + ___ cm. = 38 cm.
Work it Out
Problem Set
Problem Set
Problem Set
Problem Set
Exit Ticket
Exit Ticket