279.719 = 200 + 70 + 9 + 0.7 + 0.01 + 0.009
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202 would be 20 x 20 in expanded form.
1357 is in expanded form. In scientific notation or standard form it would be 1.357 x 103.
12.873 in exponential form would be, 1 1.2x10
Seven Hundred and Nine
2 + 0.1 + 0.06