Download Inverse Operations

Inverse Operations
• Opposite
operations that
undo each other;
addition and
subtraction are
inverse
operations;
multiplication and
division are
inverse
operations
Examples:
5 + 4 = 9, so 9 – 4 = 5
3 x 4 = 12, so 12 ÷ 4 =
3
Variable
• A letter or symbol that stands for one or more
numbers
Example:
4+j =
variable
Equation
– A number sentence that uses
an equal sign to show that two
amounts are equal. Some
equations have variables
an
equation
an equation with a variable
Fact Family – A group of facts that
share the same numbers and
use inverse operations
Fact Families can be addition and subtraction.
The 6, 3, 9 Family
6+3=9 3+6=9
9-6=3 9-3=6
Fact families can also be multiplication and division.
The 5, 2, 10 family
5x2=10 2x5=10
10÷5=2 10÷2=5