Algebra Intro

Algebra Intro

Algebra is solving for an unknown number (variable)

• If you have an equation with a number missing how do you find the missing number?

• Today we will learn how to solve for the missing number in an addition problem

Example: _ + 1 = 2

• Because it is an addition problem, we will do the opposite to solve for the missing number.

• The opposite of addition is subtraction

• Step 1: Subtract the smaller number (1) from the larger number (2)

• 2 - 1 = 1

• Step 2: Plug in the missing number to the equation

• 1 + 1 = 2

Now let's practice together

Fill in the Blanks

Find the Missing Number

1) _ + 3 = 4

Fill in the Blanks

Find the Missing Number

2) _ + 2 = 6

Fill in the Blanks

Find the Missing Number

3) _ + 3 = 9

Fill in the Blanks

Find the Missing Number

4) _ + 4 = 8

Fill in the Blanks

Find the Missing Number

5) _ + 5 = 8

GREAT JOB! You just did algebra!