It is 3000000000.
Look at the digit in tenths place. If it is 5 or more, round the digit in ones place to the next larger digit and if it is less than 5, leave the digit in ones place what it is. 0.893 rounded to the nearest cent is 1.
That rounds to 40.
It is 72.
Look at the digit in hundreds place. If it is five or greater, round the digit in thousands place to the next higher digit. If the digit in hundreds place is less than five, leave the digit in thousands place as it is. 755,082 rounded to thousands is 755,000.
To round off 128,674 to leave one nonzero digit, you would round it to 100,000.
It is 6000000.
It is 300.
It is 500.
500
It is 3000000000.
It is 90000.
500500
It is 5000000.
It is 3000000000.
485 6 592 128 674
Because it ends with a five, it rounds up to become 490.