The decimal for one and two tenths is 1.2. The decimal point is used to separate a whole number part from a fractional part. The whole number is one (1) while the fraction is two tenths (2/10) which is 0.2, so the answer become 1+0.2 which is 1.2.
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Nine hundreds as a fraction would be 9/100. Nine hundreds as a decimal number would be 9.00.