1.O.A.B.4
Created by
Shae Hare
Understand
subtraction as an
unknown-addend
problem.
Name__________________________
Example
1OAB4 Understand subtraction as an
unknown-addend problem.
Jane and Ryan were at the
beach. Together they found
48 shells. Jane found 23
shells. How many shells did
Ryan find?
My Thinking
This is an example of one of
my student’s work.
My Words
First I drew
48. Then I took
away 23 shells.
Then I counted
25 shells so I
knew he found
25 shells.
My Equation
23+25=48
My Answer
25
shells
© 2013 Shae Hare
Name__________________________
1OAB4 Understand subtraction as an
unknown-addend problem.
Jane and Ryan were at the
beach. Together they found
8 shells. Jane found 3 shells.
How many shells did Ryan
find?
My Thinking
My Equation
My Words
My Answer
© 2013 Shae Hare
Name__________________________
1OAB4 Understand subtraction as an
unknown-addend problem.
Jane and Ryan were at the
beach. Together they found
34 shells. Jane found 11
shells. How many shells did
Ryan find?
My Thinking
My Equation
My Words
My Answer
© 2013 Shae Hare
Name__________________________
1OAB4 Understand subtraction as an
unknown-addend problem.
Jane and Ryan were at the
beach. Together they found
48 shells. Jane found 23
shells. How many shells did
Ryan find?
My Thinking
My Equation
My Words
My Answer
© 2013 Shae Hare
Name__________________________
1OAB4 Understand subtraction as an
unknown-addend problem.
Mom and Sam were having a
picnic. First, Sam saw 2
black ants. Then, Sam saw
some red ants. Sam counted
6 ants in all. How many ants
were red?
My Thinking
My Equation
My Words
My Answer
© 2013 Shae Hare
Name__________________________
1OAB4 Understand subtraction as an
unknown-addend problem.
Mom and Sam were having a
picnic. First, Sam saw 12
black ants. Then, Sam saw
some red ants. Sam counted
25 ants in all. How many
ants were red?
My Thinking
My Equation
My Words
My Answer
© 2013 Shae Hare
Name__________________________
1OAB4 Understand subtraction as an
unknown-addend problem.
Mom and Sam were having a
picnic. First, Sam saw 23
black ants. Then, Sam saw
some red ants. Sam counted
67 ants in all. How many
ants were red?
My Thinking
My Equation
My Words
My Answer
© 2013 Shae Hare
Name__________________________
1OAB4 Understand subtraction as an
unknown-addend problem.
Jaime was collecting eggs
for his mother. He found 4
eggs. His mom needed 12
eggs. How many more eggs
does he need to collect?
My Thinking
My Equation
My Words
My Answer
© 2013 Shae Hare
Name__________________________
1OAB4 Understand subtraction as an
unknown-addend problem.
Jaime was collecting eggs
for his mother. He found 13
eggs. His mom needed 22
eggs. How many more eggs
does he need to collect?
My Thinking
My Equation
My Words
My Answer
© 2013 Shae Hare
Name__________________________
1OAB4 Understand subtraction as an
unknown-addend problem.
Jaime was collecting eggs
for his mother. He found 23
eggs. His mom needed 39
eggs. How many more eggs
does he need to collect?
My Thinking
My Equation
My Words
My Answer
© 2013 Shae Hare
http://www.teacherspayteachers.com/Store/Shae-Hare