To round off 128,674 to leave one nonzero digit, you would round it to 100,000.
500
Because it ends with a five, it rounds up to become 490.
It is 400.
Round it to the nearest thousand, which is 7,000 .
To round off 128,674 to leave one nonzero digit, you would round it to 100,000.
It is 300000.
It is 6000000.
It is 300.
It is 500.
500
It is 3000000000.
It is 90000.
500500
It is 5000000.
It is 3000000000.
Because it ends with a five, it rounds up to become 490.