Addition and Subtraction (Daily Life)

A submarine was 40 m below sea level.

Three hours later, it rose by 15 m. What was the new position of the submarine?

• 40+15=65

• -40-15=-65

• -40+15=25

• -40+15=-25

The temperature of a town was -3°C in the morning. Its temperature rose by 7°C at noon. What was the temperature of the town at noon?

• -3+7=+4

• -3+-7=-10

• -3-7=+10

• -3+7=-4

In an experiment, the temperature of a solution was -2°C. When it was heated, its temperature increased by 7°C. One hour later, its temperature increased by another 4°C. What was the final temperature of the solution?

• -2+7+4=9

• -2+7+4=-9

• -2-7-4=-13

• -2-7+4=-5

An eagle is flying directly above a diver.

The eagle is 7m above sea level while the diver is 2m below sea level. Find the vertical distance between the eagle and the diver.

• +7-2=5

• +7-(-2)=9

• -7-2=-9

• 7+2=9

The initial temperature of a cold storage was -1°C. 30 minutes later, its temperature dropped by 5°C. What was the new temperature of the cold storage?

• -1-5=-6

• -1-5=4

• -1-(+5)=-6

• -1+5=4

A submarine is 8 m below sea level. It descends 4 m and then descends another 3 m. Find its final position.

• -8-4-3=-15

• -8+4+3=-1

• -8-4+3=-15

• -8+4+3=15

Use a positive or a negative number!

A loss of $80

(a)  

Use a positive or a negative number!

42 m below sea level

(a)  

Use a positive or a negative number!

An increase of 5 m

(a)  

Use a positive or a negative number!

8°C below freezing point

(a)