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Standard form: 1.5*10-1 seconds, expanded form: (0.1 + 0.05) seconds.
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