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3 Digit Subtraction
Mathematics, Grade 3
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Study Guide 3 Digit Subtraction Mathematics, Grade 3
THREE-DIGIT
SUBTRACTION
What
Is
Three-Digit
Subtraction?
We
subtract
to
compare
numbers.
We
are
able
to
find
the
difference
between
numbers
through
subtraction.
We
use
subtraction
to
find
out
how
much
more
we
have
or
how
much
smaller
something
is
in
comparison
to
another
number.
How
to
subtract
three-digit
numbers:
•
Line
up
the
three
digit
numbers
so
that
the
ones,
tens,
and
hundreds
digits
are
directly
in
line
with
each
other.
Be
sure
to
place
the
larger
number
on
top.
•
Draw
a
line
under
the
bottom
number.
•
Subtract
the
bottom
digit
in
the
ones'
place
column
from
the
top
number.
If
you
cannot,
borrow
one
from
the
tens'
place
to
make
the
top
value
larger
than
the
bottom
value.
Place
the
answer
below
the
line
in
the
ones'
place
column.
•
Subtract
the
numbers
in
the
tens'
place
column.
Borrow
one
from
the
hundreds'
place
to
make
the
top
value
bigger
than
the
bottom
value,
if
it
is
not.
Place
the
difference
below
the
line
in
the
tens'
place
column.
•
Subtract
the
digits
in
the
hundreds'
place
column.
Trade
if
necessary.
Place
the
answer
below
the
line
in
the
hundreds'
place
column.
Try
This!
456
468
378
-241
-222
-
43
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