The expanded form (notation) of 804 is: (8 x 100) + (0 x 10) + (4 x 1)
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40+4+.800+.10+.05
100,000+10,000+9,000+800+70+4
In expanded form, it's 400+30. Together it's 430.To better understand here is another example 76,894 is70,000+6,000+800+90+4
Expanded form is 20 + 4 = 24
4 out of 804 as a percentage is about 0.00004975.