Which of the following is a real-world problem that could be solved with the sum −22+9?
1 Quinn is playing a card game with his friends. He had −22 points at the start of his turn, but just got 9 points. How many points does he now have?
2 The temperature was −22°F yesterday. Today the temperature is 9°F. How much warmer is it today compared with yesterday?
3 A scuba diver is 22 feet below sea level. Their friend is standing on a diving board 9 feet above sea level. What is the vertical distance between the scuba diver and their friend?
4 Layla earned $22 babysitting last weekend. Today she received $9 from her grandmother. How much money does she have all together?
The real-world problem that could be solved with the sum −22+9 is number 2: The temperature was −22°F yesterday. Today the temperature is 9°F. How much warmer is it today compared with yesterday?
Can you tell me
Yes, of course! To find out how much warmer it is today compared to yesterday, we can subtract yesterday's temperature from today's temperature.
Today's temperature: 9°F
Yesterday's temperature: -22°F
We can calculate this as:
9°F - (-22°F) = 9°F + 22°F = 31°F
So, it is 31 degrees warmer today compared to yesterday.
It was −8°F this morning, but the temperature has gone up 11° over the course of the day. What is the temperature now?
To find the current temperature after a rise of 11 degrees from the starting temperature of -8°F, we can add 11 to -8.
Starting temperature: -8°F
Change in temperature: +11°F
We can calculate this as:
-8°F + 11°F = 3°F
Therefore, the current temperature is 3°F.
There are some areas of land on Earth that are below sea level. Imagine you are at the Dead Sea in Africa, which has an elevation of about −1,410 feet (1,410 feet below sea level). You then climb up 125 feet. What is your new elevation?
To find your new elevation after climbing up 125 feet from an elevation of -1,410 feet, we can add 125 to -1,410.
Starting elevation: -1,410 feet
Climbing: +125 feet
We can calculate this as:
-1,410 feet + 125 feet = -1,285 feet
Therefore, your new elevation is -1,285 feet.
Reem owes her friend $15.25. Reem works after school and earns $43.78. After paying her friend back, how much money does she have?
To find out how much money Reem has after paying her friend back, we need to subtract the amount she owes from the amount she earns.
Amount owed: $15.25
Amount earned: $43.78
To calculate this, we subtract the amount owed from the amount earned:
$43.78 - $15.25 = $28.53
Therefore, after paying her friend back, Reem will have $28.53.