Mariah explained how to add -8 + (-4) by using the number line below.

Mariah stated that -8 + (-4) = -4 by counting four spaces to the right from -8 on the number line and ending at -4.

Which statement and number line below are true about Mariah’s explanation?

A.  Mariah is not correct. She has to move to the left on the number line since the
number being added is negative. She should have counted four spaces to the
left from -8 on the number line and ended at -12.

 

B.  Mariah is correct. -8 + (-4) = -4. She moved to the right on the number line
since she is adding.

C.  Mariah is not correct. She started at the wrong number. She should have
started at -4. She has to move to the right on the number line since she is
adding. She should have counted 8 spaces to the right from -4 on the number
line and ended at 4.

D.  Mariah is not correct. She has to move to the right on the number line since
she is adding. She should have counted 12 spaces to the right from -8 on the
number line and ended at 4.

Did Mariah Make a Mistake?
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