Maintaining Equality in Equations

Mr. Woolley introduces lesson 21, focusing on maintaining equality in equations through a card game example. Students learn to apply operations like addition, subtraction, multiplication, and division to both sides of an equation to keep them equal. The video includes practice problems and a problem set from page 116, emphasizing the importance of consistent operations on both sides of an equation. The lesson concludes with simplifying expressions and ensuring equality when adding to both sides.

What is the main concept discussed in Lesson 21?

• Understanding fractions

• Exploring algebraic expressions

• Maintaining equality in equations

• Learning about geometry

In the card game example, what happens if both players draw a negative two?

• Both players' scores become zero

• The game ends

• One player's score increases

• Both players' scores remain equal

What is the result of adding the same number to both sides of an equation?

• The equation becomes invalid

• The equation remains balanced

• The equation becomes more complex

• The equation becomes simpler

How does multiplying both sides of an equation by the same number affect it?

• It keeps the equation balanced

• It simplifies the equation

• It makes the equation invalid

• It makes one side larger

What is the result of dividing both sides of an equation by the same number?

• The equation remains equal

• The equation becomes invalid

• The equation becomes more complex

• The equation becomes unbalanced

What is an equivalent expression for 3 plus negative 5?

• Negative 4 plus 2

• 5 minus 3

• Negative 3 plus 1

• 2 plus 1

What happens when you multiply equivalent expressions by the same number?

• They become unequal

• They remain equivalent

• They become invalid

• They simplify to zero

In the problem set, which expressions matched to give a result of 6?

• A and B

• B and C

• A and E

• D and F

What is the result of simplifying the expression with a total of 17 when 5 is added to both sides?

• 19

• 22

• 20

• 24

What is the outcome when negative 3 is multiplied to both sides of an equation?

• The equation simplifies to zero

• The equation remains equal

• The equation becomes invalid

• The equation becomes more complex