The most correct standard form for 12.12 is "twelve point one two."
The form "twelve and twelve one-hundredths" is also correct but is not the standard form.
The common form "twelve point twelve" may be used from time to time (even by math teachers) but is not a correct form.
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In word form, we write eighty-four and 2 tenths.In standard form, we simplify the expression to get 84.2.
4/33 = .1212
something that looks like ax^2+bx+c
1,468,944
2,3,4,6,12 and 1212.