Rational Numbers and Expressions

This video tutorial covers Math 7 Unit 5 Lesson 13, focusing on expressions with rational numbers. It begins with an introduction to rational numbers and includes exercises to determine the truth of statements involving these numbers. The video then delves into detailed computations with rational numbers, followed by an activity involving the vertical positioning of animals. Finally, it addresses homework problems related to ratios and percentages, providing solutions and explanations.

What is the main focus of the lesson on expressions with rational numbers?

• Memorizing formulas

• Explaining reasoning

• Solving equations quickly

• Using calculators

When multiplying two negative numbers, what is the result?

• Negative

• Zero

• Positive

• Undefined

What should you do when grouping expressions with the same value?

• Use a calculator

• Group them randomly

• Look for similar-looking expressions

• Check if they have the same value

How do you evaluate an expression with given values for variables?

• Use a graph

• Guess the result

• Ignore the variables

• Substitute the values and calculate

Which expression has the largest value when a = 1/2 and b = 6?

• b cubed

• a / b

• -4b

• a squared

What is the vertical position of a dragonfly if D = -B and B = -2?

• -4

• -2

• 2

• 0

How much coffee should be used for 33 oz of water if the ratio is 2 tbsp for 6 oz?

• 13 tbsp

• 12 tbsp

• 10 tbsp

• 11 tbsp

What is the sales tax rate if an item costs $3.25 and the total with tax is $3.51?

• 7%

• 6%

• 9%

• 8%

What is the result of -22 + 5?

• -27

• 27

• 17

• -17

Which student's setup is correct for finding the original amount of soap?

• Jade

• Neither

• Lynn

• Both