2.89 = (2 x 1) + (8/10) + (9/100)
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289 = (2 x 102) + (8 x 101) + (9 x 100)
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
0.297 in expanded form is 0.2 + 0.09 + 0.007