Problem preview
MF.SN.2 Challenge MF-024-A12-V01

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

Recognize equivalent signed-operation forms

Problem

Identify every candidate that is equivalent to \(3~-~(-5)\), starts at \(3\), represents the same signed change, and ends at the same value.

A. \(3~+~5\)
B. \(3~-~(-5)\)
C. Start at \(3\) and move \(5~\text{units}~\text{right}\).
D. Start at \(3\) and move \(5~\text{units}~\text{left}\).
E. \(3~-~5\)
F. Start at \(-5\) and move \(3~\text{units}~\text{right}\).
G. \(3~+~(-5)\)
H. Start at \(3\) and move \(8~\text{units}~\text{right}\).

Big Picture

What this problem is really about

First rewrite subtracting negative five as adding its opposite, and record the operation’s starting value, signed change, and endpoint. Test every candidate against all three features, because sharing one number or merely mentioning the endpoint is not enough. Equivalent symbolic and number-line forms must begin together, move by the same signed amount, and finish together.

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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
Recognize equivalent signed-operation forms