In expanded form, it's 400+30. Together it's 430.
To better understand here is another example 76,894 is
70,000+6,000+800+90+4
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4 hundred thirty
427,013 in expanded form math ELEMENTARY
write the word form and expanded form of the number four
You write in the numbers in words when you write in expanded.
0.297 in expanded form is 0.2 + 0.09 + 0.007