Understanding Addition and Simplification in Algebra

Mrs. Lopez introduces the concept of generating equivalent expressions in this lesson for grade 7 students. The lesson covers additive inverses, opposites, and how they sum to zero. It explains how to convert subtraction into addition of opposites and demonstrates combining like terms. The video includes examples and practice problems to reinforce the concepts. The lesson concludes with a homework assignment.

What is the sum of a number and its additive inverse?

• 1

• 0

• The number itself

• Negative of the number

If you have 3 apples and subtract 3 apples, what is the result?

• 3 apples

• 0 apples

• 6 apples

• 1 apple

What is the opposite of the sum of X and 3?

• X - 3

• X + 3

• -(X + 3)

• -X - 3

How do you simplify the expression 3x - 7?

• -3x - 7

• 3x + 7

• 3x + (-7)

• -3x + 7

What is the result of combining 3x and -4x?

• 7x

• -1x

• 1x

• -7x

How do you rewrite 5 - 2 as an addition problem?

• 5 - (-2)

• 5 + (-2)

• 5 + 2

• 5 - 2

What is the simplified form of 10x + (-1x)?

• -1x

• 11x

• 9x

• 10x

In the expression 5x + 2x, what is the combined term?

• 7x

• 2x

• 3x

• 10x

What is the result of adding -4y and 3y?

• 7y

• -7y

• 1y

• -1y

How do you simplify the expression 2x + (-5x)?

• -7x

• -3x

• 3x

• 7x