Video: KS2-M17 • Paper 3 • Question 4

This graph shows the temperature in degrees Celsius (°C) from 2 am to 3 pm on a cold day. How many degrees warmer was it at 3 pm than 3 am? At 6 pm, the temperature was 4 degrees lower than at 3 pm. What was the temperature at 6 pm?

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Video Transcript

This graph shows the temperature in degrees Celsius, degrees C, from 2 am to 3 pm on a cold day. How many degrees warmer was it at 3 pm than 3 am? At 6 pm, the temperature was four degrees lower than at 3 pm. What was the temperature at 6 pm?

The 𝑦-axis on the graph shows the temperature in degrees Celsius. This line shows zero degrees Celsius. All the temperatures above this line are positive numbers. And all of the temperatures below zero are negative numbers: minus one, minus two, minus three, and so on.

The 𝑥-axis shows us the time of day, from 2 am to 7 pm. The first part of the question asks us how many degrees warmer was it at 3 pm and 3 am. The pink dot shows the temperature at 3 pm. By drawing a line from this dot to connect with the 𝑦-axes, we can see the temperature. At 3 pm, it was two degrees Celsius.

Now we need to find the temperature at 3 am. And we can see it was minus five degrees Celsius. So we need to find the difference between minus five degrees and two degrees. The orange arrow shows the difference between these two temperatures. So the quickest way to find the answer is to simply count the squares: one, two, three, four, five, six, seven. It was seven degrees warmer at 3 pm than at 3 am.

In the second part of the question, we’re told, at 6 pm, the temperature is four degrees lower than at 3 pm. First, we need to find the temperature at 3 pm. Then we can find the temperature which is four degrees lower than that. We already know that the temperature at 3 pm is two degrees Celsius.

We need to find the temperature four degrees lower than two degrees Celsius and plot this at 6 pm. This line shows the time 6 pm. Now we just need to find the temperature four degrees lower than two degrees Celsius: one, two, three, four: minus two degrees Celsius. So the temperature at 6 pm was minus two degrees Celsius.

It was seven degrees warmer at 3 pm than 3 am. And the temperature at 6 pm was minus two degrees Celsius or negative two degrees Celsius.

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