209 and 3/100 is 209.03 as a decimal and in standard form it is 2.0903*10^2
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Writing a number in standard form simply means to express the number in its 'normal' form. Therefore, your example is written in standard form as: 209.03
2.09 the 9 is in the hundredth position. .209 is 209 thousandths.
To write 209 in expanded form, you would break down the number based on its place value. 209 is composed of 2 hundreds, 0 tens, and 9 ones. Therefore, in expanded form, 209 can be written as 200 + 9.
2.09 = 209/100 which cannot be simplified.
80 000 000 + 6 000 000 + 200 000 + 9 000 + 400 + 2