Math 6 Honors Periods 6 & 7 (Thursday)

Subtracting Integers 11-3

Isn't it true that if you want to have a little less negativity, you just need to add a little positiveness!! What works in life-- works in math as well.


Rule

For all integers a and b, a- b = a + (-b)

Instead of subtracting-- ADD THE OPPOSITE

4 - (-5) = 4 + +5 = 9

We used Algebra tiles to prove this using Zero Pairs

+1 - 1 = 0 ( ZERO PAIR)

-3 - (-8) = - 3 + +8 = 5

5 - (-5) = 5 + + 5 = 10

-6 - -6 = -6 + + 6 = 0