October 14, 2013
Lesson 5
Additive Inverse Property
the sum of a number and its opposite
(or additive inverse) = 0
using numbers
so....a + -a = 0
3 + -3 = 0
October 14, 2013
Multiplicative Inverse
A number times its multiplicative
inverse is equal to 1
Also called the reciprocal
using numbers inverse of 4 is 5
5
4
so
4 ● 5 = 1
5
4
October 14, 2013
Let's practice some multiplicative inverses
1.
1
2
2.
4
3.
2
3
4.
5
October 14, 2013
To solve equations we want to use inverse
operations
the opposite operation of ....
addition is ______________
subtraction is ______________
multiplication is____________
division is ______________
October 14, 2013
To undo addition, you subtract
x+4=7
check:
To undo subtraction you add
x-2=8
check:
October 14, 2013
To undo multiplication, you divide
2x = 6
check:
To undo division, you multiply
=6
*this is the only step that
can be written next to the #
all other must be underneath
check:
October 14, 2013
October 14, 2013
October 14, 2013
October 14, 2013