|
SUBTRACTION
In this lesson
you will learn how to subtract:
|
When you subtract decimals, line up the
decimal points. If there doesn't appear to be a point, it is
understood to be to the right of the number. If
the top number has fewer decimal places than the bottom number, you
should annex zeroes. |
|
RULE |
What does
that MEAN? |
|
When you
subtract decimals, line up the
decimal points. |
5.983 – 3.642
would be written: 5.983
- 3.642 |
|
If there doesn't
appear to be a point, it is understood to be to the right of the
number. |
6 could be written
6.0;
15 could be written 15.0
etc. |
|
If the top
number has fewer decimal places than the bottom number, you should
annex zeroes. |
In the problem
6.2 - 3.988 , 6.2 would be written 6.200 so both numbers would
have three decimal places.
*as many zeroes as needed can be annexed (added) to the right of
the last significant digit |
|
Now that
you know the rules, let's look at some examples! |
|
3.12 - 2 =
(3.12 - 2.00) |
| Line
up the decimal points.
If there doesn't
appear to be a point, it is understood to be to the right of the
number. |
3.12
-2.00 |
| Subtract,
starting on the far right. |
3.12
-2.00
1.12 |
|
4 - 2.113 =
4.000 - 2.113 |
|
Line up the decimal points.
If there doesn't
appear to be a point, it is understood to be to the right of the
number. |
 |
| Subtract,
starting on the far right. Remember to "borrow" if needed! |
4.000
-2.113 1.887
|
| Check your
answer by adding. |
1.887
+2.113 4.000
|
Now a quick
summary of this lesson: when you subtract decimals, line up the
decimal points. If there doesn't appear to be a point, it is
understood to be to the right of the number. Annex as many zeroes
as needed so that both numbers have the same number of decimal places.
Ready
to Practice?
|
