Expressions and Variables in Algebra

This video tutorial covers writing and evaluating expressions, focusing on addition and subtraction. It begins with an introduction to expressions and the importance of using specific variables. The tutorial then emphasizes improving variable descriptions by including units of measure. Finally, it demonstrates how to write and evaluate expressions from story problems, using examples to illustrate the process.

How can you express a number increased by two using a variable?

• n + 2

• n / 2

• 2n

• n - 2

Why is it important to specify units when naming variables?

• To confuse the reader

• To make the variable name longer

• To make the expression look complex

• To ensure clarity and accuracy

If J represents Jeff's money, how would you express Greg having two more dollars than Jeff?

• J / 2

• 2J

• J + 2

• J - 2

What expression represents Abby reading eight more books than Kristen?

• K / 8

• 8K

• K + 8

• K - 8

What is the expression for the number of books Kristen read if Abby read 20 books and six more than Kristen?

• 6A

• A / 6

• A + 6

• A - 6

How would you express Daryl teaching one year longer than Julie?

• J - 1

• J + 1

• J / 1

• 1J

If Ian scored four fewer goals than Julia, what expression would represent Ian's goals?

• J - 4

• J + 4

• 4J

• J / 4

What expression would you use if Johan visited Niagara Falls three times fewer than Arthur?

• A / 3

• A + 3

• A - 3

• 3A

If Ian scored three fewer goals than Julia in the second half, how would you express Julia's goals?

• I - 3

• 3I

• I + 3

• I / 3

How would you express the number of times Arthur visited Niagara Falls if Johan visited two times?

• A / 2

• 2A

• A - 2

• A + 2