To round a number to a particular digit, look at the digit immediately to the right of your target, in this case, the fifth decimal place. If that digit is 4 or lower, zero it and everything to the right of it out. If that digit is 5 or higher, increase the target digit by one and zero everything to the right of it out. If your target digit is a 9, increasing it will turn it to zero and increase the digit to the left of it by one.
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37.99095 rounded to four decimal places is 37.9910.
To round 7.7 to the nearest decimal place, you would look at the digit in the second decimal place, which is 7. Since this digit is 5 or greater, you would round up the digit in the first decimal place by adding 1. Therefore, 7.7 rounded to the nearest decimal place would be 7.8.
To round the decimal 1.724 to the nearest hundredth, we must look at the thousandth place, which is 4 in this case. Since 4 is less than 5, we do not need to round up. Therefore, 1.724 rounded to the nearest hundredth is 1.72.
13.765625
3.75 rounded to the nearest whole number is 4. When rounding to the nearest whole number, if the decimal is at the .5 mark or higher, round up. If it's less than .5 round down. So 3.5 would round up to 4, but 3.4 would round down to 3.