Mastering Word Problems with Positive and Negative Decimals

What is the primary focus of this lesson?

• Multiplying and dividing decimal numbers

• Understanding fractions

• Adding and subtracting positive and negative decimal numbers

• Solving algebraic equations

In the context of the submarine problem, what does the word 'descends' signify?

• Addition

• Division

• Multiplication

• Subtraction

If a submarine descends to -22.4 meters and then rises by 12.6 meters, what is its new depth?

• 35 meters

• 10 meters

• -9.8 meters

• -35 meters

What does the term 'drops' indicate in the temperature problem?

• Subtraction

• Addition

• Multiplication

• Division

If the temperature is -2.6 degrees and it drops 0.6 degrees each hour for 4 hours, what is the final temperature?

• -2 degrees

• -4.2 degrees

• -5 degrees

• -1 degree

In the airplane problem, what does the word 'rises' signify?

• Addition

• Subtraction

• Multiplication

• Division

If an airplane is at 168.3 meters and rises by 22.5 meters, what is its new altitude before any further changes?

• 190.8 meters

• 145.8 meters

• 200.8 meters

• 180.8 meters

After rising to 190.8 meters, if the airplane then falls by 6.8 meters, what is its final altitude?

• 180 meters

• 190 meters

• 200 meters

• 184 meters

Why is it important to understand the symbols when adding or subtracting positive and negative numbers?

• To get the correct final result

• To avoid errors in division

• To simplify the problem

• To ensure correct multiplication

What is the final temperature after 4 hours if the initial temperature is -2.6 degrees and it drops 0.6 degrees each hour?

• -2 degrees

• -3.2 degrees

• -4.2 degrees

• -5 degrees