To round a number to a particular digit, look at the digit immediately to the right of your target, in this case, the ten trillions 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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Round to the nearest decimal
See related link below for a good explanation
Only if you are rounding up to the nearest dollar. Normal rounding rules would make it 40.
If you’re rounding 34,700, here’s the scoop: To the nearest thousand: It bumps up to 35,000. To the nearest hundred or ten: It’s already sitting pretty at 34,700. Simple as that! Just depends on how tight you want those rounding rules.
Using the standard rules for rounding, 35 will be rounded to 40 as the nearest 10.