Plz help meeee, ASAP I am trying to help my sister, we have been stuck on this for hours( will give brainlest )

Answer:
1. 3 2a. 30 2b. 3 3a. 1200 3b. 15 4.1305
Step-by-step explanation:
You are basically solving 435x3 but you are breaking it up.
400x3+ 30x3+ 5x3 = 435x3.