 An
open sentence
is a sentence which
contains a variable.
|
"n
+ 5 = 12" is an open
sentence -- the
variable is "n."
Open sentence: n +
5 = 12
Variable: n
|
|
A variable
is simply a letter used to represent a
number that is unknown.
n = 7
|
|
The variable
n may appear on
either side of a number sentence. |
|
3 + n = 9 |
9 = 3
+ n |
| n + 6
= 9 |
9 = n
+ 6 |
| Example: |
|
5 + n = 12 |
The open
sentence is 5 + n =
12
The variable is
n |
| To
solve an open
sentence you can do the opposite operation.
For example if it is an adding problem, you would subtract to find
the missing variable. |
5 + n =
12
12 - 5 = 7
n = 7
5 + 7 = 12 |
 |
Remember:
One
way to solve an open
sentence is to do the opposite operation.
For example if it is an adding problem, you would subtract to find
the missing variable. |
Let's Practice!
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here
|
