Question

the temperature on monday was -1.5°C. The temperature on Tuesday was 2.6°C less than the temperature on Monday.what was the temperature on Tuesday?

Answer 1

Our starting point is -1.5 and we need to decrease from there by 2.6. This can be written in math as:
$-1.5+(-2.6)$

So then the temperature on Tuesday is -4.1.