|
|
6 + 4 = 10 |
or |
6 + 4 = 9 |
|
Both
problems cannot be right! One is
TRUE and one is
FALSE! |
In Math, sometimes
you are asked to say if a number model, or a mathematical statement, is True or False.
Let's look at some examples where it would be good to know if a
something is true or false.
|
John wanted to buy two candy bars
and has $2.00. Each bar cost $0.85. The clerk says he does
not have enough money to buy the two candy bars and shows John
the following statement as proof.
$0.85 + $0.85 = $16.10
Is this True or False? |
| You know that $0.85
+ $0.85 = $1.70 and you can prove it by using coins and adding
correctly! |
| So the clerk was
wrong, and you can afford those candy bars! |
Here's another
example of a math statement that you can prove to be right or
wrong.
|
|
| Andy wants to go to
the park to swing. His mom needs him to be home by 3:00.
He asks his friend Jay what time it is.
Jay says it is 3:30.
Andy looks at the clock and it
looks like this: |
 |
| Is Jay's time
of 3:30 true or false? |
Because you can tell
time, you know his statement is false and Andy
will be home on time! |
So you see there are some
times when math statements can be true and some times when he statements
are false.
| I do have enough
money for 2 candy bars! |
True math
statement! |
$0.85 + $0.85
< $2.00 |
| I can tell time so I
will be home on time! |
True math statement! |
3:00 is when the
little hand is on three and the big hand is on 12 |
|
