Expanded or Standard Form

Expand this number " 1 899 765 "

Expand this number 73 243 809

Write this number in standard form- 4 000 000 + 200 000 + 10 000 + 7 000 + 400 + 30 + 2

Write this number in standard form- 3 000 000 + 200 000 + 40 000 + 3 000 + 800 + 9