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An open number sentence (also called an open equation) is a statement that contains one or more unknown variables and is considered neither true nor false until specific values are assigned to those variable; essentially it is a math statement that needs a value for the variable. The value of the blank or variable determines whether the statement is true or false.
Example: x + 5 = 10 is an open number sentence because we don't know if it's true or false until we determine value of the "x"
Try this 6-8 minute warm up routine with your students!!!
(SMP 3: Construct viable arguments and critique the reasoning of others)
Get students justifying their thinking by asking questions like:
How do you know?
How did you figure that out?
Do you agree/disagree? Why or why not?
Can you retell what ____ just said in your own words?
What other Open Number Sentences can you give to your students to get them discussing math and justifying their thinking?
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