Temperature Changes and Calculations

This video tutorial covers Math 7 Unit 5 Lesson 2, focusing on changing temperatures and adding signed numbers. It begins with an activity to identify which arrows don't belong, followed by exercises on temperature changes using a number line. The lesson progresses to handling negative starting temperatures and real-world comparisons of temperatures in different cities. The session concludes with homework problems and a review of key concepts, emphasizing the use of number lines and absolute values in solving temperature-related problems.

What is the main focus of the initial activity involving arrows?

• Identifying the longest arrow

• Finding the shortest arrow

• Determining which pair of arrows doesn't belong

• Counting the number of arrows

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

• 40°

• 60°

• 50°

• 30°

When starting at -20° and going 30° warmer, where do you end up?

• 10°

• 20°

• -10°

• 0°

In the context of the lesson, what does a greater absolute value indicate?

• The final temperature

• The starting temperature

• The direction of the arrow

• The sign of the result

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

• 8°C

• 20°C

• 10°C

• 18°C

How do you calculate the temperature in Fairbanks if it's 10° colder than Minneapolis, which is -12°?

• -10°

• -22°

• -2°

• -12°

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

• 17°C

• 12°C

• 13°C

• 15°C

At midnight, the temperature is -6°C, and at midday, it is 9°C. By how much did the temperature rise?

• 12°C

• 9°C

• 6°C

• 15°C

If the temperature was 80° and then fell 20°, what is the final temperature?

• 70°

• 80°

• 60°

• 50°

What is the constant proportionality if 30 wheels are on 5 buses?

• 5

• 6

• 8

• 7