Answer from: Fedor Kapischev:
We're all mired in self-deception and false ideas about the world. Helping, sharing...
To solve this example, we can use the old-fashioned "of adding in columns". We add up the hundredths of a number first. 4+5=9. Then we add the tenths: 2+2=4. And now we add the whole numbers. We get: 4+3=7