Basic Math Equations

What is the inverse operation of DIVISION?

• Addition

• Subtraction

• Multiplication

• Division

The objective when solving an equation is to....

• isolate the variable.

• check the solution.

• guess and check.

• Combine Like Terms.

19  + a  =  -50

• a = -950

• a =  -69

• a = -31

• a = -50/19

x + 4 = -3

• -1

• 4

• -7

• 8

Solve for r:
r + 236 = 450

• r=686

• r=214

• r=1.9

• r=106,200

Solve:

• 72

• 1.8

• 7.2

• 5

Which equation represents:
The weight of a goal increased by 12 pounds is 38 pounds. 

• w + 12 = 38

• w - 12 = 38

• w/12=38

• 12w=38

Write an equation and solve.
Sam baked cookies for his math class’s end-of-year party.  There are 28 people in Jorge’s math class including Sam and his teacher.  Jorge baked enough cookies for everyone to get 3 cookies each.  How many cookies did Sam bake?

• 28(3)=x ; 84

• 28x = 3; 3/28

• x/3 = 28 ; 84

• 28 + x = 3; -25

Write an equation and solve an equation for the following problem.
My brother is 14 years old.  My sister says that her age minus twelve is equal to my brother’s age.  How old is my sister?

• 14 + 12 = x; 26

• 14 - 12 = x; 2

• x + 12= 14; 26

• x - 12 = 14; 26

When solving equations, you use...

• the same operation

• the opposite operation

• whatever you want

• mental math