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Unknowns
Mrs. Dewey wrote the equation below on the board. The n is called an unknown. She said one thing that mathematicians do is to look for the number to replace n that will make the number sentence true.
Romesh studied the equation: 3072 = 3000 + n + 2
- Replace the letter with a number to make each equation true.
- 892 = 800 + n + 2
- 892 = 700 + n + 2
- 783 = n + 80 + 3
- 783 = 700 + 70 + n
- 3000 + 10 + 7 = n
- 3000 + 10 + 7 = 3000 − n
- 982 + 8 + 10 = 982 + 10 + 10 − n
- Explain how you know your answer to Question 8D is true.
- Ming decided that n equals 6 in the following number sentence:
He used the following number line to explain his thinking. Do you agree with Ming? Why or why not?
