Expressions and Variables in Algebra

The video tutorial covers writing and evaluating expressions using addition and subtraction. It emphasizes the importance of specificity in naming variables, including units of measure. The tutorial provides examples and practice problems to improve variable descriptions and solve story problems using expressions. Students learn to identify unknown quantities and evaluate expressions with given information.

What is the result of increasing a number by two?

• Dividing the number by two

• Adding two to the number

• Multiplying the number by two

• Subtracting two from the number

Why is it important to be specific when naming variables?

• To make the variable names longer

• To ensure clarity and understanding of what the variable represents

• To confuse the reader

• To make the code look complex

If J represents Joshua's speed, what additional information is needed?

• The color of Joshua's shoes

• The time of day

• The unit of measurement, such as meters per second

• The type of terrain

How would you describe the variable for the number of CDs Carolyn has?

• Let K equal the number of songs Carolyn has

• Let K equal the number of DVDs Carolyn has

• Let K equal the number of books Carolyn has

• Let K equal the number of CDs Carolyn has

What expression represents Greg having two more dollars than Jeff?

• G + 2

• J - 2

• J + 2

• G - 2

If Abby read eight more books than Kristen, what expression represents the number of books Abby read?

• K - 8

• K + 8

• A - 8

• A + 8

How would you express the number of years Daryl has been teaching if he has taught one year longer than Julie?

• J + 1

• J - 1

• D - 1

• D + 1

What expression represents Ian scoring four fewer goals than Julia?

• I - 4

• J + 4

• J - 4

• I + 4

If Johan visited Niagara Falls three times fewer than Arthur, what expression represents Johan's visits?

• J - 3

• A - 3

• A + 3

• J + 3

What is the expression for Julia's goals if Ian scored three fewer goals in the second half of the season?

• J - 3

• J + 3

• I - 3

• I + 3