Interpreting Line Graphs

Year 5 investigated how quickly two different liquids cooled over 5 minutes. They began their investigation by warming the two liquids in the microwave and then they measured the temperature of each liquid every minute as they cooled down.

This graph shows the results: 

Challenge 1

1. What was the temperature of the orange juice after two minutes?
2. At which minute was the temperature of the blackcurrant squash 47˚C?
3. By how many degrees did the temperature of the orange juice cool from minute 1 to minute 2?
4. By how many degrees did the temperature of the blackcurrant squash cool from minute 3 to minute 4?
5. Approximately, how long did it take for the temperature of the orange juice to drop by 10˚C?
6. By how many degrees did the temperature of the blackcurrant squash cool altogether?

Extension Challenge 2

Use the line graph to decide whether each of the statements below are true or false. If you think the statement is false, explain the mistake you think the child has made when they read the line graph.

“After two minutes, the difference in temperature between the two drinks was 1˚C”

“After three minutes, the orange juice was cooler than the blackcurrant squash”

“The temperature of the blackcurrant squash dropped by 5˚C between minute 2 and 3”

“There was never more than a difference of 2˚C between the temperatures of the two drinks”