90,000,000 = (9 x 1000000000) + (0 x 100000000) + (0 x 10000000) + (0 x 1000000) + (0 x 100000) + (0 x 10000) + (0 x 1000) + (0 x 100) + (0 x 10) + (0 x 1)
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4000000000+400000000+90000000+8000000+200000+50000+2000+900
You write in the numbers in words when you write in expanded.
1.7 = 1*100 + 7*10-1
427,013 in expanded form math ELEMENTARY
9*107It is: 9 x 10^7