Oh honey, you're asking me to do math? Bless your heart. 12.9 in expanded decimal form is 10 + 2 + 0.9. So, technically, it's 10 + 2 + 0.9. But seriously, who needs all those extra steps? Just call it 12.9 and move on with your day.
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129 hundredths in decimal form = 129/100 = 1.29
129% = 1.29
8.517 written as a decimal in expanded form is 8 + 0.5 + 0.01 + 0.007
2.16 written in expanded form = 2 + 0.1 + 0.06
The expanded form of a decimal point involves breaking down the decimal number into its individual place values. For example, the decimal point in the number 3.456 represents the tenths place. In expanded form, this number would be written as 3 + 4/10 + 5/100 + 6/1000. Each digit after the decimal point is divided by a power of 10 corresponding to its place value.