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As we've said before,
When subtracting
larger whole numbers,
start in the ONES column and move left.
However sometimes
we can't subtract
from the column we're in,
so we need to borrow from the column to the left.
But
there are times
when the number to the left is a ZERO ;
when this happens
you must to borrow
from the next TWO
places to the left.
Examples:
300 - 157 =
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You can't
subtract 0-7 in the ONES
column,...
So you look to borrow
one group
from the tens column.
However the tens column has a zero ( 0
), Now you must borrow from the
tens AND hundreds column COMBINED ( 30
).
You now have only 29
left in the tens and hundreds column and
,
add the group of ten you borrowed to the ones
column,
now making it 10.
then :
10-7 = 3 (ones column),
9-5 = 4 (tens column),
and
2-1 = 1 (hundreds column)
=
143 |
500 - 362 =
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You can't subtract
0-2 in the ONES
column,...
So you look to borrow
one group
from
the tens column.
However the tens column has a zero ( 0
),
Now you must borrow from the tens
AND hundreds column COMBINED ( 50 ).
You now have only 49 left in the tens
and hundreds column
and,
add the group of ten you borrowed to the ones
column,
now making it 10.
then :
10-2 = 8 (ones column),
9-6 = 3 (tens column),
and
4-3 = 1 (hundreds column)
=
138
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REMEMBER:
* Always start subtracting
from the ONES column, and
move your way left
!
** If you CAN'T subtract
from the column you're in,
you need to borrow one
from the column to the left.
*** But if there is a zero in the next
column,
borrow from the next two columns to the
left.
Let's Practice!
click here
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