How do you write 312393205 in expanded form?

Answer 1

Each of these is correct;

1. (3 x 108) + (1 x 107) + (2 x 106) + (3 x 105) + (9 x 104) + (3 x 103) + (2 x 102) + (0 x 101) + (5 x 100).
2. (3 x 100000000) + (1 x 10000000) + (2 x 1000000) + (3 x 100000) + (9 x 10000) + (3 x 1000) + (2 x 100) + (0 x 10) + (5 x 1).