Remainder problem

GRE Quant Problem Solving
1

What is the remainder when 1.4350770914 \times 10^{10} is divided by 7?

sorry, i have no idea how to start even after watching the arithmetic series. Please helpppp.

2

Its discussed here https://forums.gregmat.com/t/questions-from-difficult-quant-questions-class-on-may-5-2021/2234/6?u=kremlinofficial