Grade 5

To extend this Headline Story, you might tell students how long it took to heat up the oven for different dishes Brett was making, and have them figure out the target temperatures.

Brett turned on the oven. He looked at the thermometer every 5 minutes and noticed the temperature had risen by the same amount each time. If the temperature in the oven was 75^{o}F when he first turned it on, how long will it take to get to 450^{o}F?

- It depends how much the temperature goes up in 5 minutes.
- From 75
^{o}to 450^{o}is a change of 375^{o}. If it goes up 25^{o}every 5 minutes, it will take 15 five-minute intervals, or 75 minutes. - If it goes up 100
^{o}in 5 minutes, it will take 3 ¾ five-minute intervals, which is almost 20 minutes. - It wouldn’t wait over an hour for an oven to warm up.
- The temperature likely increases around 100
^{o}in each 5-minute interval.

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