Transcript 2.7 Adding Two Digit Numbers with a Number Line

Adding Two Digit Numbers
Number Line
Module 2.7
Adding Two Digit Numbers
Number Line
Describe what you know about the above image?
Where would 15 be on the number line? How do you
know?
Where would 46 be?
What could be here? How could you figure it out?
Adding Two Digit Numbers
Number Line
Imagine you buy two items with these prices. What
is the total cost?
Adding Two Digit Numbers
Number Line
What do you notice about the numbers on the
number line?
What jumps could we make to show we added?
Adding Two Digit Numbers
Number Line
60
70
80
What numbers should we mark on this number line
to help us figure out the total?
What jumps could we make to show we added?
Adding Two Digit Numbers
Number Line
30
50
60
70
What numbers should we mark on this number line
to help us figure out the total?
What jumps could we make to show we added?
Adding Two Digit Numbers
Number Line
40
70
80
What numbers should we mark on this number line
to help us figure out the total?
What jumps could we make to show we added?
Math Groups
Rotation
Teacher
1
ORANGE
Independe
nt Work
1.Page 4445
2.Addition
Dice
PINK
2
YELLOW
ORANGE
PINK
3
Pink
Yellow
Orange
1. Bring
Workbook
Fluency
1. Ongoing
Practice 2.4
2. Slide +/-
YELLOW
Reflection
 What do the red arrows indicate?
 How is $14 represented?
 Why do you think they used 10 + 4? Why not 7 + 7?
Reflection
 Could you have started with 13 on these number lines?
Reflection
 When you had to add 20
to another number, did
you make two jumps of
10, or one jump of 20?
 Did you do the dame for
all the questions like
that??