Three decimals that round to 3.4 are 3.35, 3.45, and 3.44. When rounding to one decimal place, if the digit to the right is 5 or greater, the digit being rounded increases by 1. If the digit is less than 5, the digit being rounded remains the same.
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how many decimals in hundredths round to 0.5
round 1.998 to the four decimals as needed = 1.9980
4.0
A whole number doesn't have decimals so you could just round it to 3.