Examples of what pupils should know and be able to do
The temperature is at freezing point. It falls by 10 degrees, then rises by 7 degrees. What is the temperature now?
Probing questions
The answer is −8. Give me three possible questions.
The result of subtracting one integer from another is −2. What might the two integers be?
What if pupils find this a barrier?
The suggested lesson develops pupils' understanding of adding and subtracting integers through the image of a number line. As a follow-up, pupils should be encouraged to visualise relevant sections of number lines in their heads when working out additions and subtractions of integers.
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