Step by step
The question
Question: It is −6°C.
It warms up 4 degrees.
What is the temperature now?
1 Write it as a sum
We start at −6.
Warms up means up: add 4.
−6 + 4
Below zero is negative.
−6°C: below zero
warms up 4 → + 4
2 Work it out
Start at −6.
Go up 4.
Careful!
We start at −6, not at 6.
Keep the minus sign.
Careful: not 6 + 4 = 10 ✗
We land on −2°C.
= −2°C
So the answer is −2°C: 2 degrees below zero.
3 Check
Let's check: go back.
−2 minus 4 is −6, where we started.
So the answer is right!
−2 − 4 = −6
Let's look back.
First: write it as a sum.
Then: work it out.
Last: check.
Answer
= −2°C