Lets Add Integers Another Way: Using symbols or 2-colored counters.

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Presentation transcript:

Lets Add Integers Another Way: Using symbols or 2-colored counters

Adding Integers with Counters RED = NEGATIVE (-) YELLOW = POSITIVE (+)

Adding Integers with Counters Problem #1  = ? A.Count out _____ red counters B.Count out _____ yellow counters C.Remove each PAIR of red/yellow counters (remember these are called ZERO PAIRS). D.Count the remaining red or yellow counters. E.What is your final answer? _____

Adding Integers with Counters Problem #2  5 + (-7) = ? A.Count out _____ red counters B.Count out _____ yellow counters C.Remove each PAIR of red/yellow counters (remember these are called ZERO PAIRS). D.Count the remaining red or yellow counters. E.What is your final answer? _____

Adding Integers with Counters Problem #3  -5 + (-2) = ? A.Count out _____ red counters B.Count out _____ yellow counters C.Remove each PAIR of red/yellow counters (remember these are called ZERO PAIRS). D.Count the remaining red or yellow counters. E.What is your final answer? _____

Adding Integers with Counters Problem #4  5 + (-8) + 4 = ? A.Count out _____ red counters B.Count out _____ yellow counters C.Remove each PAIR of red/yellow counters (remember these are called ZERO PAIRS). D.Count the remaining red or yellow counters. E.What is your final answer? _____

Adding Integers with Counters Problem #5  (-2) = ? A.Count out _____ red counters B.Count out _____ yellow counters C.Remove each PAIR of red/yellow counters (remember these are called ZERO PAIRS). D.Count the remaining red or yellow counters. E.What is your final answer? _____

Show what you know… At the bottom of your paper, write an explanation of how you would solve the given problem using 2- color counters OR +/- symbols. Remember to be specific and thoughtful. Problem  = ?

More practice with counters… Adding integers with counters