Video: Adding Positive Integers to Negative Integers in Word Problems

During a five-day cold wave, James recorded the temperature each day at noon. The temperature was −9°F on Monday, −8°F on Tuesday, −7°F on Wednesday, −5°F on Thursday, and −4°F on Friday. The temperature at noon on Saturday was 13°F warmer than the temperature on Thursday. What was the temperature on Saturday?

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Video Transcript

During a five-day cold wave, James recorded the temperature each day at noon. The temperature was negative nine degrees Fahrenheit on Monday, negative eight degrees on Tuesday, negative seven degrees on Wednesday, negative five degrees on Thursday, and negative four degrees Fahrenheit on Friday. The temperature at noon on Saturday was 13 degrees warmer than the temperature on Thursday. What was the temperature on Saturday?

We’re told in the question that the temperature on Thursday was negative five degrees Fahrenheit. On Saturday, the temperature was 13 degrees warmer. This means that, to calculate the temperature on Saturday, we need to add 13 degrees to negative five degrees. We can do this using a number line. Adding five to negative five gives us zero. As five plus eight is equal to 13, adding another eight takes us to positive eight. This means that negative five plus 13 is equal to eight.

This means that the temperature on Saturday was eight degrees Fahrenheit.

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