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MF.SN.2 Challenge MF-024-A13-V04

Add and subtract signed numbers and explain the meaning of the sign changes.

Choose a smart strategy for signed operations

Problem

A temperature starts at \(4.5^{\circ}\text{C}\), changes by \(-9^{\circ}\text{C}\), and then changes by \(+2.5^{\circ}\text{C}\). Consider these strategies: A, write \(\text{one}~\text{signed}~\text{expression}\); B, treat \(-9\) as the temperature; C, add magnitudes; D, subtract a negative. Choose the appropriate strategy, then give the final temperature.

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Four variants of this problem type
Curriculum context
Standard
MF.SN.2
Category
Signed Numbers
Domain
Operations
Objective
Add and subtract signed numbers and explain the meaning of the sign changes.
Problem type
Choose a smart strategy for signed operations