Inequalities and Basic Arithmetic

In lesson 23, Mrs. Bobby explains how to substitute values into expressions, equations, and inequalities to determine their truthfulness. The lesson covers various examples, including working with whole numbers, fractions, and decimals. Students learn to identify true and false statements and adjust values to make false statements true. The lesson concludes with a summary of key concepts and a reminder of the importance of understanding substitution in math.

What is the main focus of this lesson?

• Solving quadratic equations

• Substituting values into expressions and checking their truth

• Graphing linear equations

• Understanding geometric shapes

What is the result of substituting 8 for X in the equation X + 4 = 12?

• False, because 8 + 4 equals 10

• True, because 8 + 4 equals 14

• False, because 8 + 4 does not equal 12

• True, because 8 + 4 equals 12

If 3 times a number is greater than 15, which of the following numbers would make the inequality true?

• 4

• 5

• 6

• 4.5

Which of the following values for G makes the inequality 3G > 15 false?

• 5

• 6

• 4

• 5.5

What is the improper fraction form of 4 and 1/2?

• 9/2

• 8/2

• 5/2

• 10/2

What value of F makes the inequality F/4 < 2 true?

• 8

• 4

• 10

• 2

In the inequality 14.2 < 25.8 - 10.3, what is the result after performing the subtraction?

• 14.2

• 16.5

• 13.5

• 15.5

What is the correct value of H if 8 divided by H equals 4?

• 8

• 2

• 4

• 6

Which of the following statements is true for the inequality 3 > 1.5 + 0.25?

• 3 is less than 1.75

• 3 is equal to 3

• 3 is equal to 1.75

• 3 is greater than 1.75

What is the result of 1.5 + 0.25?

• 1.5

• 1.75

• 1.25

• 2.0