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3.11 Open Sentences
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Homework Review
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Mental Math Find the sum or difference.
16 – 5 = ____
8 + 14 = ____
180 + 50 = ____
210 – 30 = ____
92 + 59 = ____
184 – 126 = ____
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Math Message
Write your defense in your Math Notebook.
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What is an OPEN SENTENCE?
In this sentence, the letter x stands for the missing number. It is called a variable.
You could have also written it as:
What number could you write in place of the
to change
into a true number sentence?
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Open Sentences
A sentence that has a variable in it, like the one above, is called an open sentence.
To solve the open sentence, replace the variable with a number that makes the sentence true.
The number that makes the number sentence true is called the solution.
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Let’s try some more…
Rewrite each number sentence on your whiteboard with the solution in
place of the variable.
Circle the solution.
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Find the solutions…
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Broken Calculator Activity
Solve it using your calculator, but WITHOUT using the minus key.
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More Broken Calculator Problems…
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Partner Work – Math Journal page 73.
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Independent Work – Math Journal page 74.
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Independent Work – Math Journal page 75.
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Tonight’s Homework
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Math Boxes