When rounding to a specific place, take a look at the digit immediately to the right of the target, in this case, the seventh decimal place. If that digit is 4 or less, zero everything to the right of the target out. If that digit is 5 through 9, increase the target by one and zero everything to the right of it out. If the target is a 9, increasing it will turn it to zero and increase the digit to the left of the target by one.
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7 If you mean integers, 7. If you mean decimals: An infinite number of decimals are between 6 and 8. 6.1, 6.2, 6.3 and so on. Then you can get decimals like 6.111112222222 I assume you mean integers so 7.
round 1.998 to the four decimals as needed = 1.9980
how many decimals in hundredths round to 0.5
4.0