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Open Number Sentences
Mathematics, Grade 3
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Study Guide Open Number Sentences Mathematics, Grade 3
❮
1
/
2
❯
OPEN
NUMBER
SENTENCES
What
Are
Open
Number
Sentences?
•
Open
number
sentences
are
equations
that
give
one
part
of
the
equation
along
with
the
answer.
•
In
order
to
solve
an
open
number
sentence,
the
inverse
operation
is
used.
How
to
solve
open
number
sentences:
•
When
solving
an
open
number
sentence,
first
look
at
the
operation
that
is
being
used
in
the
number
sentence.
The
inverse
operation
will
need
to
be
used.
•
If
it
is
an
addition
problem,
you
will
need
to
use
subtraction.
For
example:
Solve
5
+
___
=
7.
To
find
the
missing
part
of
the
equation,
you
will
need
to
subtract
5
from
both
sides.
5
+
___
=
7
-5
-5
By
subtracting
5
from
both
sides,
we
find
that
the
answer
is
2!
5
+
2
=
7
•
If
it
is
a
subtraction
problem,
you
will
need
to
use
addition.
For
example:
Solve
___
–
8
=
4
To
find
the
missing
part
of
the
equation,
you
will
need
to
add
8
to
both
sides.
–
8
=
4
+8
+8
By
adding
8
to
both
sides,
you
see
the
answer
is
12!
12
–
8
=
4
© Copyright NewPath Learning. All Rights Reserved.
Permission
is
granted
for
the
purchaser
to
print
copies
for
non-commercial
educational
purposes
only.
Visit
us
at
www.NewPathLearning.com.
Try
This!
Fill
in
the
correct
answer
for
each
open
number
sentence.
8
+
___
=
13
___
-
3
=
11
3
+
___
=
15
___
-
5
=
15
___
+
17
=
22
___
-
4
=
18
© Copyright NewPath Learning. All Rights Reserved.
Permission
is
granted
for
the
purchaser
to
print
copies
for
non-commercial
educational
purposes
only.
Visit
us
at
www.NewPathLearning.com.
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