it is easier to estimate by 10 because its going to be more accurate and it will be much faster. hope u got this answer
all units are in multiples of ten
1,010 [The comma is a thousand separator, which is optional. It makes it easier to read.]
In words, 10000000000 is "ten billion." This number is composed of ten digits: one followed by ten zeros. In the international system of numeration, each group of three digits is separated by a comma, making it easier to read large numbers.
To the nearest ten, 30
To the nearest ten, 20
To the nearest ten, 240
To the nearest ten, 480
To the nearest ten, 230
To the nearest ten, 30
To the nearest ten, 210
To the nearest ten, 2670
To the nearest ten, 730