A number in standard form is just the same way you are always used to seeing it. Like for example: 256. To write that same number using expanded notation, you have to think of the place values of each of the digits. The number is the sum of those values. 256 = (2 x 100) + (5 x 10) + (6 x 1). That's 256 in expanded notation.
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8.12 in standard form. 8+0.1+0.02 in expanded
.4 (0.4) in standard form is: 0.4 In expanded form: 0.4 = (0 x 1) . (4/10)
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the usual way of writing a number using digit is that expanded from or standard from
Four tenths in expanded form is: (0 x 1) . (4/10)Four tenths in standard form is 4/10 or 0.4