
Broken Rulers
Presentation
•
Mathematics
•
2nd - 3rd Grade
•
Practice Problem
•
Hard
Standards-aligned
Erika Larson
Used 59+ times
FREE Resource
10 Slides • 4 Questions
1
By Erika Larson
2
What is a broken ruler?
3
How can you do this?
4
Method 1:
Subtract
5
6
Fill in the Blanks
What is the length of the eraser?
Type answer...
7
Subtract:
21 - 18 = 3 inches
Count on:
18-19, 19-20, 20-21 = 3 inches!
8
Fill in the Blanks
How about this paperclip?
Type answer...
9
Did you get 2 inches?
Let's try another..
10
Fill in the Blanks
How long is the crayon?
Type answer...
11
I counted up using my fingers like this...
Start with 4, tap for each number
5, 6, 7, 8, 9
5 inches!
12
Fill in the Blanks
Last one --- how long is the car?
Type answer...
13
I subtracted this time, like this:
12 - 8 = 4
4 inches!
14
- Name of Author
Go back to Formative to practice more
By Erika Larson
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