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When answering negative number problems, we first need to decide whether we need to add or subtract.
Example:
Question
Sandra has £30 in her bank account.
She spends £45 on a new cricket set.
How much does she have now?
Answer
Sandra spends money, which means we need to subtract.
£30 - £45 = -£15 meaning that she has spent more than she has in her bank account!
Question
The temperature in London at 3 am was -3°C.
At midday the next day, it had risen by 8°C.
What is the temperature at midday the next day?
Answer
This time, the temperature has risen, which means we need to add.
-3°C + 8°C = 5°C
Let's have a go at some questions now.
