208000478 in expanded form = (2 x 100000000) + (0 x 10000000) + (8 x 1000000) + (0 x 100000) + (0 x 10000) + (0 x 1000) + (4 x 100) + (7 x 10) + (8 x 1)
To write 208,000,478 in expanded form, you break it down by place value: 200,000,000 + 8,000,000 + 400,000 + 70 + 8. This shows each digit's contribution to the overall value of the number.