3.45 is a decimal.
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To write 345 as a decimal, you place the decimal point after the last digit. So, 345 written as a decimal is 345.0. This is because the decimal point is always placed after the whole number part, even if there are no decimal digits.
345 rounded to the nearest tenth is 345. There is no change.
you can change a fraction to a decimal by dividing the bottom number into the top number.
0.5 is a decimal so therefore you cant change a decimal to a decimal. But, 0.5 as a number is 5.
3.25 is a decimal.