Evaluating Expressions with Decimals and Fractions

The video tutorial provides practice in evaluating expressions with two variables. It demonstrates step-by-step how to substitute given values for variables and simplify the expressions. The first example involves variables J and K, while the second example uses M and N. The tutorial encourages viewers to attempt solving the expressions independently before following along with the guided solutions.

What are the values of J and K in the first example?

• J = 0.5, K = 1

• J = 0.5, K = 0.25

• J = 1, K = 0.5

• J = 0.25, K = 0.5

What is the first step in evaluating the expression 7J + 5 - 8K?

• Add 7 and 5

• Multiply 7 by K

• Replace J with 0.5 and K with 0.25

• Subtract 8 from 5

What is the result of 7 times 0.5?

• 0.35

• 7

• 5

• 3.5

What is 8 times 0.25?

• 2

• 0.5

• 4

• 1

What is the final result of the expression 7J + 5 - 8K when J = 0.5 and K = 0.25?

• 7.5

• 6.5

• 8.5

• 5.5

What are the values of M and N in the second example?

• M = 30, N = 1/2

• M = 30, N = 1/4

• M = 20, N = 1/2

• M = 10, N = 1/4

What is the first step in evaluating the expression 0.1M + 8 - 12N?

• Replace M with 30 and N with 1/4

• Subtract 12 from 8

• Multiply 0.1 by N

• Add 0.1 and 8

What is 0.1 times 30?

• 0.3

• 0.03

• 30

• 3

What is 12 times 1/4?

• 2

• 3

• 6

• 4

What is the final result of the expression 0.1M + 8 - 12N when M = 30 and N = 1/4?

• 8

• 10

• 6

• 12