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Inverse relationship between addition & subtraction
 

Inverse relationship between addition & subtraction

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    Inverse relationship between addition & subtraction Inverse relationship between addition & subtraction Presentation Transcript

    • Addition and Subtraction + - Finding the Inverse
    • Question?What doesinverse mean?
    • DefinitionInverse means to "undo" OR something similar
    • For example…You could say that messy is the inverse of a clean (they are opposites and “undo” each other).
    • In math, we say that…• Addition is the inverse of subtraction• Subtraction is the inverse of addition Because these two operations “undo” each other
    • Let’s Count on to 20 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
    • Let’s Add + =4 1 5
    • So… 4+1=5What about 1 + 4? Does that equal 5 too? Let’s see… 1+4=5 YES!
    • Let’s Count back from 20 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
    • Let’s Subtract - =6 4 2
    • So... 6–4=2 GREAT!Watch what happens when I switch the “-” and the “=” signs and make the “-” a “+” 6=4+2
    • = +6 4 2 6=4+2 you can also write it like this…4+2=6 OR 2+4=6
    • Let’s try that again! (+) 5–3=2 --Switch the signs around-- 5=3+2You could also write it like this… 3+2=5 OR 2+3=5
    • Let’s try that one more time! This time we are going to start with addition 5+4=9 4+5=9 --Switch the signs-- (remember, when doing subtraction you ALWAYS start with the bigger number) 9–4=5 OR 9–5=4
    • Here are some more examples of the inverse at work… 9 + 1 = 10 10 – 1 = 9 1 + 9 = 10 10 – 9 = 1 2+2=4 4–2=2 6 + 4 = 10 10 – 4 = 6 4 + 6 = 10 10 – 6 = 4
    • So…what is the inverse?The inverse is what undoes the first equationAddition can undo subtraction and subtraction can undo addition
    • Let’s keep practicing!