Temperature Changes and Proportional Relationships

The video covers adding signed numbers, focusing on temperature changes. It includes activities using number lines to visualize positive and negative temperature changes. The lesson also compares real-world temperatures in different cities, emphasizing the concept of absolute value. Homework involves applying these concepts to solve temperature-related problems.

What is the main focus of the lesson in Math 7 Unit 5 Lesson 2?

• Multiplying fractions

• Solving quadratic equations

• Understanding geometric shapes

• Changing temperatures and adding signed numbers

In the arrow activity, what are you supposed to identify?

• The longest arrow

• The arrow pointing north

• The arrow with the brightest color

• Which pair of arrows doesn't belong

If you start at 40° and get 10° warmer, what is the final temperature?

• 40°

• 30°

• 60°

• 50°

When starting at -20° and going 30° warmer, what is the resulting temperature?

• 10°

• 0°

• -10°

• 20°

What determines the sign of the result when adding a negative and a positive number?

• The last number in the equation

• The first number in the equation

• The number with the larger absolute value

• The number with the smaller absolute value

If the temperature in Houston is 8°C and it's 10°C warmer in Orlando, what is the temperature in Orlando?

• 18°C

• 10°C

• 8°C

• 20°C

If the temperature is -2°C and it rises by 15°C, what is the new temperature?

• 12°C

• 13°C

• 10°C

• 17°C

Does the table with values 30/5, 48/8, 60/10, and 90/15 represent a proportional relationship?

• No, because the values are too large

• Yes, with a constant proportionality of 5

• No, because the values are not consistent

• Yes, with a constant proportionality of 6

If Noah made 64 cookies and sold 90% of them, how many cookies are left?

• 10 cookies

• 6 cookies

• 8 cookies

• 12 cookies