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ADDITION
In this lesson
you will learn how to:
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So the rule
is: to add two or more numbers in decimal form, line up their
decimal points. |
Let's try some!
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First example:
7.31 + 8.45 = |
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Step
One: Write it vertically, lining up the decimal points |
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Step
Two: Starting on the right, add the columns ( in this
case, start with the hundredths place).
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That's easy,
right? |
Let's try another
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Second
example: 4.39 + 8.4 = |
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Step One:
Write it vertically, lining up the decimal points.
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Step
Two: Starting on the right, add the columns. In this
case, start with the hundredths place, even though there is only one
number with a hundredths digit. If you want, you can annex a 0
in that space.
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Still easy,
right? |
One last one!
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Third
example: 6.287 + 8 =
But wait, there is only one
decimal point, or is there another one? |
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Step One:
Before you can line up the decimal points, you must remember
where the decimal point is in a whole number! |
The decimal point is
understood to be on the right side of the whole number!
Therefore 8 is really 8. |
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Step Two:
Now write it vertically, lining up the decimal points. You may
add as many 0s to the right of the decimal point as you want or
need.
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Step
Three: Starting on the right, add the columns
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6.287
+ 8 .000
14 .287
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Now a quick
summary of this lesson: when you add 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.
Ready
for Practice?
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