Five. Count from the first nonzero digit to the last nonzero digit.
A counter example is a disproving of an answer. The counterexample to this is basically your saying if you have two nonzero digits in the tenths place and subtract it, you'll always get a nonzero digit in the answer. but if you have 560.4 - 430.4, then you'll get 130.0. there is a zero in the tenths place. I just disproved that you will always get a nonzero digit in the tenths place. 4 - 4 = 0. the 4s represent the tenths place in each of the 4s in the problem. walah. :P
To round off 128,674 to leave one nonzero digit, you would round it to 100,000.
It is 400.
500
It is the leading digit.
Five. Count from the first nonzero digit to the last nonzero digit.
A counter example is a disproving of an answer. The counterexample to this is basically your saying if you have two nonzero digits in the tenths place and subtract it, you'll always get a nonzero digit in the answer. but if you have 560.4 - 430.4, then you'll get 130.0. there is a zero in the tenths place. I just disproved that you will always get a nonzero digit in the tenths place. 4 - 4 = 0. the 4s represent the tenths place in each of the 4s in the problem. walah. :P
200
To round off 128,674 to leave one nonzero digit, you would round it to 100,000.
0.2.
It is 400.
It is 300000.
It is 6000000.
It is 300.
It is 500.
It is front-end estimation.