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3 Digit Addition
Mathematics, Grade 3
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Study Guide 3 Digit Addition Mathematics, Grade 3
THREE-DIGIT
ADDITION
What
Is
Three-Digit
Addition?
Adding
large
numbers
involves
breaking
the
problem
down
into
smaller
addition
facts.
How
to
add
three-digit
numbers:
1.
Place
one
number
above
the
other.
2.
Line
up
the
hundreds,
tens,
and
ones
places.
3.
Draw
a
line
under
the
bottom
number.
4.
Add
the
ones
place
digits.
If
this
number
is
larger
than
10,
place
a
one
above
the
tens
place
column
and
place
the
ones
digit
below
the
line
in
the
ones
place
column.
5.
Add
the
tens
place
digits
and
place
the
answer
below
the
line
and
in
the
tens
place
column
(regroup
if
needed).
6.
Add
the
numbers
in
the
hundreds
place
column
and
place
the
hundreds
sum
below
the
line
and
before
the
other
number
below
the
line.
If
there
was
regrouping,
place
the
1
above
the
thousands
place
column.
7.
The
thousands
place
column
only
has
a
1
in
it
which
should
be
placed
below
the
line
in
the
thousands
place
column.
Try
This!
361
469
372
+267
+405
+265
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