Subtraction Expressions

The video tutorial explains the difference between expressions and equations, using examples to illustrate each concept. It guides viewers through creating subtraction expressions from word problems, including the use of variables. The tutorial also covers solving equations to find the value of variables, emphasizing the importance of maintaining balance in equations. Finally, it provides practice problems for viewers to apply what they've learned.

Which of the following is an example of an expression?

• 9A + 15 = 42

• 2 * 3

• 25 - S = 14

• S = 11

What is the subtraction expression for Mary giving 11 jelly beans to Sam?

• 11 + 25

• 11 - 25

• 25 + 11

• 25 - 11

If Mary has 14 jelly beans left after giving some to Sam, what equation represents this situation?

• 25 + S = 14

• 14 - S = 25

• 25 - S = 14

• S - 25 = 14

What is the first step in solving the equation 25 - S = 14?

• Subtract 14 from both sides

• Add 14 to both sides

• Add S to both sides

• Subtract S from both sides

How many jelly beans did Mary give to Sam if S = 11?

• 11

• 14

• 25

• 9

What is the subtraction expression for John giving 5 baseball cards to Robert?

• 5 + 17

• 17 + 5

• 5 - 17

• 17 - 5

If Susan gave some apples to Pam, which expression represents this?

• S + 5

• S - 5

• 5 - S

• 5 + S